diff --git a/code/__DEFINES/~skyrat_defines/factions.dm b/code/__DEFINES/~skyrat_defines/factions.dm
index 7b055154df4..96ad6c15c1a 100644
--- a/code/__DEFINES/~skyrat_defines/factions.dm
+++ b/code/__DEFINES/~skyrat_defines/factions.dm
@@ -1,4 +1,9 @@
+// Black Mesa away mission factions
+
 #define FACTION_XEN "xen"
 #define FACTION_HECU "hecu"
 #define FACTION_BLACKOPS "blackops"
 #define FACTION_BLACKMESA "blackmesa"
+
+// ERT faction
+#define FACTION_ERT "ert"
diff --git a/code/__DEFINES/~skyrat_defines/signals.dm b/code/__DEFINES/~skyrat_defines/signals.dm
index 3cfa7414dcd..5386e470264 100644
--- a/code/__DEFINES/~skyrat_defines/signals.dm
+++ b/code/__DEFINES/~skyrat_defines/signals.dm
@@ -68,3 +68,6 @@
 
 /// From mob/living/*/set_combat_mode(): (new_state)
 #define COMSIG_LIVING_COMBAT_MODE_TOGGLE "living_combat_mode_toggle"
+
+/// To chambered round on gun's `process_fire()`: (list/iff_factions)
+#define COMSIG_CHAMBERED_BULLET_FIRE "chambered_bullet_fire"
diff --git a/code/modules/antagonists/ert/ert.dm b/code/modules/antagonists/ert/ert.dm
index 04bf5772075..8730093c417 100644
--- a/code/modules/antagonists/ert/ert.dm
+++ b/code/modules/antagonists/ert/ert.dm
@@ -32,6 +32,7 @@
 		forge_objectives()
 	if(equip_ert)
 		equipERT()
+	owner?.current.faction |= FACTION_ERT //SKYRAT ADDITION
 	. = ..()
 
 /datum/antagonist/ert/get_team()
diff --git a/code/modules/projectiles/projectile.dm b/code/modules/projectiles/projectile.dm
index 61158fe042e..d73e5ed171e 100644
--- a/code/modules/projectiles/projectile.dm
+++ b/code/modules/projectiles/projectile.dm
@@ -182,6 +182,11 @@
 	var/static/list/projectile_connections = list(
 		COMSIG_ATOM_ENTERED = .proc/on_entered,
 	)
+	//SKYRAT ADDITION START
+	/// If this should be able to hit the target even on direct firing when `ignored_factions` applies
+	var/ignore_direct_target = FALSE
+	//SKYRAT ADDITION END
+
 	/// If true directly targeted turfs can be hit
 	var/can_hit_turfs = FALSE
 
@@ -505,7 +510,7 @@
 		var/mob/M = firer
 		if((target == firer) || ((target == firer.loc) && ismecha(firer.loc)) || (target in firer.buckled_mobs) || (istype(M) && (M.buckled == target)))
 			return FALSE
-	if(ignored_factions?.len && ismob(target) && !direct_target)
+	if(ignored_factions?.len && ismob(target) && (!direct_target || ignore_direct_target)) //SKYRAT EDIT: ignore_direct_target
 		var/mob/target_mob = target
 		if(faction_check(target_mob.faction, ignored_factions))
 			return FALSE
diff --git a/modular_skyrat/master_files/code/modules/mod/modules/_module.dm b/modular_skyrat/master_files/code/modules/mod/modules/_module.dm
index 65b9a2f3cfe..6bb910ff83f 100644
--- a/modular_skyrat/master_files/code/modules/mod/modules/_module.dm
+++ b/modular_skyrat/master_files/code/modules/mod/modules/_module.dm
@@ -46,6 +46,7 @@
 		add_overlay = FALSE
 
 	if(add_overlay)
+		icon_to_use = overlay_icon_file
 		var/mutable_appearance/module_icon = mutable_appearance(icon_to_use, icon_state_to_use, layer = standing.layer + 0.1) // Just changed the raw icon path to icon_to_use and the used_overlay to icon_state_to_use
 		module_icon.appearance_flags |= RESET_COLOR
 		. += module_icon
diff --git a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_guns.dmi b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_guns.dmi
index 97ba89bed08..2146e292682 100644
Binary files a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_guns.dmi and b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_guns.dmi differ
diff --git a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_lefthand.dmi b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_lefthand.dmi
index c722960545d..e9ba5873a5f 100644
Binary files a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_lefthand.dmi and b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_lefthand.dmi differ
diff --git a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_righthand.dmi b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_righthand.dmi
index 6e561a279b7..c673bc2ba20 100644
Binary files a/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_righthand.dmi and b/modular_skyrat/modules/gunsgalore/icons/guns/gunsgalore_righthand.dmi differ
diff --git a/modular_skyrat/modules/marines/code/gear.dm b/modular_skyrat/modules/marines/code/gear.dm
new file mode 100644
index 00000000000..b2ff5c0bcbf
--- /dev/null
+++ b/modular_skyrat/modules/marines/code/gear.dm
@@ -0,0 +1,115 @@
+/obj/item/gun/ballistic/automatic/ar/modular/m44a
+	name = "\improper NT M44A Pulse Rifle"
+	desc = "A specialized Nanotrasen-produced ballistic pulse rifle that uses compressed magazines to output absurd firepower in a compact package."
+	icon_state = "m44a"
+	inhand_icon_state = "m44a"
+	icon = 'modular_skyrat/modules/marines/icons/m44a.dmi'
+	righthand_file = 'modular_skyrat/modules/marines/icons/m44a_r.dmi'
+	lefthand_file = 'modular_skyrat/modules/marines/icons/m44a_l.dmi'
+	fire_sound = 'modular_skyrat/modules/marines/sound/m44a.ogg'
+	fire_delay = 1
+	burst_size = 3
+	spread = 6
+	pin = /obj/item/firing_pin/implant/mindshield
+	can_suppress = FALSE
+	emp_damageable = FALSE
+	can_bayonet = FALSE
+	realistic = FALSE
+	mag_display = TRUE
+	mag_display_ammo = FALSE
+	mag_type = /obj/item/ammo_box/magazine/m44a
+	w_class = WEIGHT_CLASS_BULKY
+	slot_flags = ITEM_SLOT_BELT | ITEM_SLOT_OCLOTHING
+	company_flag = COMPANY_NANOTRASEN
+
+/obj/item/ammo_box/magazine/m44a
+	name = "m44a magazine (.300 compressed)"
+	desc = "This magazine uses a bluespace compression chamber to hold a maximum of ninety-nine .300 caliber caseless rounds for the M44A pulse rifle."
+	icon = 'modular_skyrat/modules/marines/icons/m44a.dmi'
+	icon_state = "300compressed"
+	max_ammo = 99
+	multiple_sprites = AMMO_BOX_FULL_EMPTY_BASIC
+	ammo_type = /obj/item/ammo_casing/caseless/c300
+	caliber = "300comp"
+
+/obj/item/ammo_casing/caseless/c300
+	name = ".300 caseless round"
+	desc = "A .300 caseless round for proprietary Nanotrasen firearms."
+	caliber = "300comp"
+	projectile_type = /obj/projectile/bullet/a300
+
+/obj/projectile/bullet/a300
+	name = ".300 caseless bullet"
+	damage = 13
+	armour_penetration = 30 //gonna actually kill the brit that made this var require a U in armor
+	embedding = null
+	shrapnel_type = null
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/scoped
+	name = "\improper NT M44AS Pulse Rifle"
+	desc = "A specialized Nanotrasen-produced ballistic pulse rifle that uses compressed magazines to output absurd firepower in a compact package. This one's fitted with a long-range scope."
+	icon_state = "m44a_s"
+	inhand_icon_state = "m44a_s"
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/scoped/Initialize()
+	. = ..()
+	AddComponent(/datum/component/scope, range_modifier = 2.2)
+
+/obj/item/gun/ballistic/shotgun/automatic/as2/ubsg
+	name = "\improper M2 auto-shotgun underbarrel"
+	desc = "This shouldn't be heeere!"
+	can_suppress = FALSE
+	has_gun_safety = FALSE
+	mag_type = /obj/item/ammo_box/magazine/internal/shot/as2/ubsg
+
+/obj/item/ammo_box/magazine/internal/shot/as2/ubsg
+	max_ammo = 3
+	ammo_type = /obj/item/ammo_casing/shotgun/buckshot
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/shotgun
+	name = "\improper NT M44ASG Pulse Rifle"
+	desc = "A specialized Nanotrasen-produced ballistic pulse rifle that uses compressed magazines to output absurd firepower in a compact package. This one's fitted with a two-round semi-automatic underbarrel 12 gauge shotgun."
+	icon_state = "m44a_sg"
+	inhand_icon_state = "m44a_sg"
+	/// Reference to the underbarrel shotgun
+	var/obj/item/gun/ballistic/shotgun/automatic/as2/ubsg/underbarrel
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/shotgun/Initialize()
+	. = ..()
+	underbarrel = new /obj/item/gun/ballistic/shotgun/automatic/as2/ubsg(src)
+	update_appearance()
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/shotgun/afterattack_secondary(atom/target, mob/living/user, flag, params)
+	underbarrel.afterattack(target, user, flag, params)
+	return SECONDARY_ATTACK_CONTINUE_CHAIN
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/shotgun/attackby(obj/item/attacking_item, mob/user, params)
+	if(!istype(attacking_item, /obj/item/ammo_casing))
+		..()
+	if(istype(attacking_item, underbarrel.magazine.ammo_type))
+		underbarrel.attack_self(user)
+		underbarrel.attackby(attacking_item, user, params)
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/grenadelauncher
+	name = "\improper NT M44AGL Pulse Rifle"
+	desc = "A specialized Nanotrasen-produced ballistic pulse rifle that uses compressed magazines to output absurd firepower in a compact package. This one's fitted with an underbarrel grenade launcher, and a red dot scope to help align it. Compensating for something?"
+	icon_state = "m44a_gl"
+	inhand_icon_state = "m44a_gl"
+	/// Underbarrel grenade launcher reference
+	var/obj/item/gun/ballistic/revolver/grenadelauncher/underbarrel
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/grenadelauncher/Initialize()
+	. = ..()
+	underbarrel = new /obj/item/gun/ballistic/revolver/grenadelauncher/unrestricted(src)
+	update_appearance()
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/grenadelauncher/afterattack_secondary(atom/target, mob/living/user, flag, params)
+	underbarrel.afterattack(target, user, flag, params)
+	return SECONDARY_ATTACK_CONTINUE_CHAIN
+
+/obj/item/gun/ballistic/automatic/ar/modular/m44a/grenadelauncher/attackby(obj/item/attacking_item, mob/user, params)
+	if(!istype(attacking_item, /obj/item/ammo_casing))
+		..()
+	if(istype(attacking_item, underbarrel.magazine.ammo_type))
+		underbarrel.attack_self(user)
+		underbarrel.attackby(attacking_item, user, params)
diff --git a/modular_skyrat/modules/marines/code/miscellaneous.dm b/modular_skyrat/modules/marines/code/miscellaneous.dm
deleted file mode 100644
index 51eb7f589da..00000000000
--- a/modular_skyrat/modules/marines/code/miscellaneous.dm
+++ /dev/null
@@ -1,16 +0,0 @@
-// 1 2 3 4 marine corps marine corps
-//parent type already has EMP protection and stuff
-
-/obj/item/storage/backpack/ert/marine
-	name = "marine backpack"
-	desc = "A spacious backpack with lots of pockets and a magnetic latching mechanism to attach to whatever gear one might wear."
-	icon = 'modular_skyrat/master_files/icons/obj/clothing/backpacks.dmi'
-	worn_icon = 'modular_skyrat/master_files/icons/mob/clothing/back.dmi'
-	icon_state = "marine"
-	inhand_icon_state = "securitypack"
-	resistance_flags = FIRE_PROOF
-
-/obj/item/storage/backpack/ert/marine/ComponentInitialize()
-	. = ..()
-	var/datum/component/storage/STR = GetComponent(/datum/component/storage)
-	STR.max_combined_w_class = 30
diff --git a/modular_skyrat/modules/marines/code/mod.dm b/modular_skyrat/modules/marines/code/mod.dm
new file mode 100644
index 00000000000..4c74b667268
--- /dev/null
+++ b/modular_skyrat/modules/marines/code/mod.dm
@@ -0,0 +1,91 @@
+// 1 2 3 4 marine corps marine corps
+
+/datum/mod_theme/marines
+	name = "marine"
+	desc = "Developed by Nanotrasen in collaboration with multiple high-profile contractors, this specialized suit is made for high-intensity combat."
+	extended_desc = "A black and blue suit of Nanotrasen design made to be utilized by corporate space marines \
+		in active combat situations where standard gear won't cut it. Lightweight composite armor plating over \
+		a strong exoskeleton ensures that no speed is sacrificed for protection, and a variety of unique \
+		modules keep the wearer efficient during active combat situations. When response teams fail, \
+		you're the backup's backup - the desperate measures."
+	default_skin = "marine"
+	armor = list(MELEE = 50, BULLET = 50, LASER = 50, ENERGY = 50, BOMB = 50, BIO = 100, FIRE = 100, ACID = 50, WOUND = 20) //honestly quite incredible
+	atom_flags = PREVENT_CONTENTS_EXPLOSION_1
+	resistance_flags = FIRE_PROOF|ACID_PROOF
+	max_heat_protection_temperature = FIRE_IMMUNITY_MAX_TEMP_PROTECT
+	siemens_coefficient = 0
+	slowdown_inactive = 0.5
+	slowdown_active = 0
+	complexity_max = DEFAULT_MAX_COMPLEXITY + 10 //drr drr drr
+	allowed_suit_storage = list(
+		/obj/item/flashlight,
+		/obj/item/tank/internals,
+		/obj/item/ammo_box,
+		/obj/item/ammo_casing,
+		/obj/item/restraints/handcuffs,
+		/obj/item/assembly/flash,
+		/obj/item/melee/baton,
+		/obj/item/gun/ballistic,
+		/obj/item/melee/hammer,
+	)
+	skins = list(
+		"marine" = list(
+			MOD_ICON_OVERRIDE = 'modular_skyrat/modules/marines/icons/mod.dmi',
+			MOD_WORN_ICON_OVERRIDE = 'modular_skyrat/modules/marines/icons/wornmod.dmi',
+			HELMET_FLAGS = list(
+				UNSEALED_LAYER = NECK_LAYER,
+				UNSEALED_CLOTHING = SNUG_FIT,
+				SEALED_CLOTHING = THICKMATERIAL|STOPSPRESSUREDAMAGE|BLOCK_GAS_SMOKE_EFFECT|FLASH_PROTECTION_WELDER,
+				UNSEALED_INVISIBILITY = HIDEFACIALHAIR,
+				SEALED_INVISIBILITY = HIDEMASK|HIDEEARS|HIDEEYES|HIDEFACE|HIDEHAIR|HIDESNOUT,
+				SEALED_COVER = HEADCOVERSMOUTH|HEADCOVERSEYES|PEPPERPROOF,
+			),
+			CHESTPLATE_FLAGS = list(
+				UNSEALED_CLOTHING = THICKMATERIAL,
+				SEALED_CLOTHING = STOPSPRESSUREDAMAGE,
+				SEALED_INVISIBILITY = HIDEJUMPSUIT|HIDETAIL,
+			),
+			GAUNTLETS_FLAGS = list(
+				UNSEALED_CLOTHING = THICKMATERIAL,
+				SEALED_CLOTHING = STOPSPRESSUREDAMAGE,
+				CAN_OVERSLOT = TRUE,
+			),
+			BOOTS_FLAGS = list(
+				UNSEALED_CLOTHING = THICKMATERIAL,
+				SEALED_CLOTHING = STOPSPRESSUREDAMAGE,
+				CAN_OVERSLOT = TRUE,
+			),
+		),
+	)
+
+/obj/item/mod/control/pre_equipped/marine
+	theme = /datum/mod_theme/marines
+	applied_cell = /obj/item/stock_parts/cell/bluespace
+	initial_modules = list(
+		/obj/item/mod/module/storage/large_capacity,
+		/obj/item/mod/module/emp_shield,
+		/obj/item/mod/module/magnetic_harness,
+		/obj/item/mod/module/holster,
+		/obj/item/mod/module/flashlight,
+		/obj/item/mod/module/jetpack,
+		/obj/item/mod/module/noslip,
+		/obj/item/mod/module/power_kick,
+		/obj/item/mod/module/megaphone,
+		/obj/item/mod/module/springlock/contractor,
+		/obj/item/mod/module/dna_lock, //in lieu of req_access
+		/obj/item/mod/module/visor/sechud, //for identifying teammates also in suits
+	)
+
+/obj/item/mod/control/pre_equipped/marine/engineer //smartgunner version of modsuit, with less versatile modules but the ALMIGHTY SMARTGUN
+	theme = /datum/mod_theme/marines
+	applied_cell = /obj/item/stock_parts/cell/bluespace
+	initial_modules = list(
+		/obj/item/mod/module/storage/large_capacity,
+		/obj/item/mod/module/emp_shield/advanced,
+		/obj/item/mod/module/flashlight,
+		/obj/item/mod/module/jetpack,
+		/obj/item/mod/module/noslip,
+		/obj/item/mod/module/dna_lock,
+		/obj/item/mod/module/visor/sechud,
+		/obj/item/mod/module/smartgun/marines,
+	)
diff --git a/modular_skyrat/modules/marines/code/modsuit_modules.dm b/modular_skyrat/modules/marines/code/modsuit_modules.dm
new file mode 100644
index 00000000000..7200056f9c4
--- /dev/null
+++ b/modular_skyrat/modules/marines/code/modsuit_modules.dm
@@ -0,0 +1,32 @@
+/obj/item/mod/module/smartgun
+	name = "MOD smartgun module"
+	desc = "A bulky module that attahces to the back of a MODsuit, this \
+			module is comprised of two parts, a holster and the M63A4 \"Smartgun\". \
+			The holster works as storage for a gun that would be otherwise uncarryable, \
+			and the gun itself fires at a blistering rate of fire, capable of suppressing enemies \
+			without hurting teammates thanks to IFF technology."
+	icon_state = "smartgun"
+	icon = 'modular_skyrat/modules/marines/icons/items/module.dmi'
+	overlay_icon_file = 'modular_skyrat/modules/marines/icons/mobs/mod_modules.dmi'
+	module_type = MODULE_ACTIVE
+	complexity = 3
+	active_power_cost = DEFAULT_CHARGE_DRAIN * 0.3
+	device = /obj/item/gun/ballistic/automatic/smart_machine_gun
+	incompatible_modules = list(/obj/item/mod/module/smartgun)
+	cooldown_time = 0.5 SECONDS
+	overlay_state_inactive = "module_smartgun_off" //appears on back when it's off
+	overlay_state_active = "module_smartgun_on"
+	/// Power consumed per bullet fired
+	var/power_per_bullet = 25
+
+/obj/item/mod/module/smartgun/on_activation()
+	. = ..()
+	RegisterSignal(device, COMSIG_GUN_FIRED, .proc/consume_energy)
+
+/obj/item/mod/module/smartgun/proc/consume_energy(mob/user, atom/target, params, zone_override)
+	SIGNAL_HANDLER
+
+	drain_power(power_per_bullet)
+
+/obj/item/mod/module/smartgun/marines
+	removable = FALSE //no stealing!!
diff --git a/modular_skyrat/modules/marines/code/smartgun.dm b/modular_skyrat/modules/marines/code/smartgun.dm
new file mode 100644
index 00000000000..f38ee3ec073
--- /dev/null
+++ b/modular_skyrat/modules/marines/code/smartgun.dm
@@ -0,0 +1,148 @@
+/obj/item/gun/ballistic/automatic/smart_machine_gun
+	name = "\improper M63A4 \"Smartgun\""
+	desc = "A weapon with a blistering rate of fire, so heavy that it needs to be mounted on a modsuit to wield. \
+	It's equipped with IFF technology, allowing the bullets to intentionally miss friendly targets."
+	icon = 'modular_skyrat/modules/marines/icons/items/guns.dmi'
+	lefthand_file = 'modular_skyrat/modules/marines/icons/mobs/guns_l.dmi'
+	righthand_file = 'modular_skyrat/modules/marines/icons/mobs/guns_r.dmi'
+	worn_icon = 'modular_skyrat/modules/marines/icons/mobs/mod_modules.dmi'
+	icon_state = "smartgun"
+	worn_icon_state = "module_smartgun_off" // just in case. You shouldn't be able to do this, though
+	inhand_icon_state = "smartgun"
+	fire_sound = 'modular_skyrat/modules/gunsgalore/sound/guns/fire/mg34_fire.ogg'
+	rack_sound = 'sound/weapons/gun/l6/l6_rack.ogg'
+	suppressed_sound = 'sound/weapons/gun/general/heavy_shot_suppressed.ogg'
+	fire_sound_volume = 70
+	fire_select_modes = list(SELECT_SEMI_AUTOMATIC, SELECT_FULLY_AUTOMATIC)
+	weapon_weight = WEAPON_HEAVY
+	slot_flags = ITEM_SLOT_BACK
+	w_class = WEIGHT_CLASS_HUGE
+	spread = 18
+	mag_type = /obj/item/ammo_box/magazine/smartgun_drum
+	can_suppress = FALSE
+	fire_delay = 0.5
+	realistic = FALSE
+	bolt_type = BOLT_TYPE_OPEN
+	show_bolt_icon = FALSE
+	tac_reloads = FALSE
+	burst_size = 1
+	pin = /obj/item/firing_pin/implant/mindshield
+	mag_display_ammo = FALSE
+	mag_display = FALSE
+	/// If the gun's dustcover is open or not
+	var/cover_open = FALSE
+	/// Factions that the gun cannot shoot under any circumstances
+	var/list/iff_factions = list("ert")
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/ComponentInitialize()
+	. = ..()
+	AddElement(/datum/element/update_icon_updates_onmob)
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/process_fire(atom/target, mob/living/user, message = TRUE, params = null, zone_override = "", bonus_spread = 0)
+	. = ..()
+	if(chambered)
+		SEND_SIGNAL(chambered, COMSIG_CHAMBERED_BULLET_FIRE, iff_factions)
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/examine(mob/user)
+	. = ..()
+	. += "<b>RMB with an empty hand</b> to [cover_open ? "close" : "open"] the dust cover."
+	if(cover_open && magazine)
+		. += span_notice("It seems like you could use an <b>empty hand</b> to remove the magazine.")
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/attack_hand_secondary(mob/user, list/modifiers)
+	if(!user.canUseTopic(src))
+		return
+	cover_open = !cover_open
+	to_chat(user, span_notice("You [cover_open ? "open" : "close"] [src]'s cover."))
+	playsound(src, 'sound/weapons/gun/l6/l6_door.ogg', 60, TRUE)
+	update_appearance()
+	return SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/can_shoot()
+	if(cover_open)
+		balloon_alert_to_viewers("cover open!")
+		return FALSE
+	return chambered
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/eject_magazine(mob/user, display_message = TRUE, obj/item/ammo_box/magazine/tac_load = null)
+	if(!cover_open)
+		to_chat(user, span_warning("The cover is closed! Open it before ejecting the magazine!"))
+		return
+	return ..()
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/attackby(obj/item/attack_item, mob/user, params)
+	if(!cover_open && istype(attack_item, mag_type))
+		to_chat(user, span_warning("[src]'s dust cover prevents a magazine from being fit."))
+		return
+	..()
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/update_overlays()
+	. = ..()
+	. += "[base_icon_state]_door_open"
+
+/obj/item/gun/ballistic/automatic/smart_machine_gun/unrestricted
+    pin = /obj/item/firing_pin
+// Magazine itself
+
+/obj/item/ammo_box/magazine/smartgun_drum
+	name = "smartgun drum (10x28mm caseless)"
+	icon = 'modular_skyrat/modules/marines/icons/items/ammo.dmi'
+	icon_state = "smartgun_drum"
+	ammo_type = /obj/item/ammo_casing/smart/caseless/a10x28
+	caliber = "a10x28"
+	max_ammo = 500
+	multiple_sprites = AMMO_BOX_FULL_EMPTY
+	w_class = WEIGHT_CLASS_NORMAL
+
+// Smart ammo casings
+
+/obj/item/ammo_casing/smart
+	icon = 'modular_skyrat/modules/gunsgalore/icons/ammo/ammo.dmi'
+
+/obj/item/ammo_casing/smart/Initialize(mapload)
+	. = ..()
+	RegisterSignal(src, COMSIG_CHAMBERED_BULLET_FIRE, .proc/iff_transfer)
+
+/obj/item/ammo_casing/smart/proc/iff_transfer(datum/source, list/iff_factions)
+	SIGNAL_HANDLER
+
+	if(istype(loaded_projectile, /obj/projectile/bullet/smart))
+		var/obj/projectile/bullet/smart/smart_proj = loaded_projectile
+		smart_proj.ignored_factions = iff_factions.Copy()
+
+/obj/item/ammo_casing/smart/caseless
+	firing_effect_type = null
+	heavy_metal = FALSE
+
+/obj/item/ammo_casing/smart/caseless/fire_casing(atom/target, mob/living/user, params, distro, quiet, zone_override, spread, atom/fired_from)
+	if (!..()) //failed firing
+		return FALSE
+	if(istype(fired_from, /obj/item/gun))
+		var/obj/item/gun/shot_from = fired_from
+		if(shot_from.chambered == src)
+			shot_from.chambered = null //Nuke it. Nuke it now.
+	qdel(src)
+	return TRUE
+
+/obj/item/ammo_casing/smart/caseless/update_icon_state()
+	. = ..()
+	icon_state = "[initial(icon_state)]"
+
+/obj/item/ammo_casing/smart/caseless/a10x28
+	name = "10x28mm bullet"
+	desc = "A 10x28m caseless bullet."
+	icon_state = "792x57-casing"
+	caliber = "a10x28"
+	projectile_type = /obj/projectile/bullet/smart/a10x28
+
+// Smart bullets
+
+/obj/projectile/bullet/smart
+	ignore_direct_target = TRUE
+
+/obj/projectile/bullet/smart/a10x28
+	name = "10x28mm bullet"
+	damage = 12
+	armour_penetration = 5
+	wound_bonus = 15
+	wound_falloff_tile = 1
diff --git a/modular_skyrat/modules/marines/icons/items/ammo.dmi b/modular_skyrat/modules/marines/icons/items/ammo.dmi
new file mode 100644
index 00000000000..b2932bacdd5
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/items/ammo.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/items/guns.dmi b/modular_skyrat/modules/marines/icons/items/guns.dmi
new file mode 100644
index 00000000000..be2425192b5
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/items/guns.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/items/module.dmi b/modular_skyrat/modules/marines/icons/items/module.dmi
new file mode 100644
index 00000000000..79cf11a3603
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/items/module.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/m44a.dmi b/modular_skyrat/modules/marines/icons/m44a.dmi
new file mode 100644
index 00000000000..dd22e31779d
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/m44a.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/m44a_l.dmi b/modular_skyrat/modules/marines/icons/m44a_l.dmi
new file mode 100644
index 00000000000..83a5d2aab45
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/m44a_l.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/m44a_r.dmi b/modular_skyrat/modules/marines/icons/m44a_r.dmi
new file mode 100644
index 00000000000..8db10306b6e
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/m44a_r.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/mobs/guns_l.dmi b/modular_skyrat/modules/marines/icons/mobs/guns_l.dmi
new file mode 100644
index 00000000000..28e2ed89066
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/mobs/guns_l.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/mobs/guns_r.dmi b/modular_skyrat/modules/marines/icons/mobs/guns_r.dmi
new file mode 100644
index 00000000000..dbfd40ac628
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/mobs/guns_r.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/mobs/mod_modules.dmi b/modular_skyrat/modules/marines/icons/mobs/mod_modules.dmi
new file mode 100644
index 00000000000..cbd396e077d
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/mobs/mod_modules.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/mod.dmi b/modular_skyrat/modules/marines/icons/mod.dmi
new file mode 100644
index 00000000000..f273df36885
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/mod.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/smartgun.dmi b/modular_skyrat/modules/marines/icons/smartgun.dmi
new file mode 100644
index 00000000000..f3c19135191
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/smartgun.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/smartgun_back.dmi b/modular_skyrat/modules/marines/icons/smartgun_back.dmi
new file mode 100644
index 00000000000..dad573eaa48
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/smartgun_back.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/smartgun_l.dmi b/modular_skyrat/modules/marines/icons/smartgun_l.dmi
new file mode 100644
index 00000000000..e5b3709c5d4
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/smartgun_l.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/smartgun_module.dmi b/modular_skyrat/modules/marines/icons/smartgun_module.dmi
new file mode 100644
index 00000000000..79cf11a3603
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/smartgun_module.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/smartgun_r.dmi b/modular_skyrat/modules/marines/icons/smartgun_r.dmi
new file mode 100644
index 00000000000..5f665165e6e
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/smartgun_r.dmi differ
diff --git a/modular_skyrat/modules/marines/icons/wornmod.dmi b/modular_skyrat/modules/marines/icons/wornmod.dmi
new file mode 100644
index 00000000000..8b17fecdbd8
Binary files /dev/null and b/modular_skyrat/modules/marines/icons/wornmod.dmi differ
diff --git a/modular_skyrat/modules/marines/sound/m44a.ogg b/modular_skyrat/modules/marines/sound/m44a.ogg
new file mode 100644
index 00000000000..7f41ffa1671
Binary files /dev/null and b/modular_skyrat/modules/marines/sound/m44a.ogg differ
diff --git a/modular_skyrat/modules/modular_ert/code/marine_override/modified_equipment.dm b/modular_skyrat/modules/modular_ert/code/marine_override/modified_equipment.dm
index ad958c7e655..d4157eb2479 100644
--- a/modular_skyrat/modules/modular_ert/code/marine_override/modified_equipment.dm
+++ b/modular_skyrat/modules/modular_ert/code/marine_override/modified_equipment.dm
@@ -1,9 +1,54 @@
-/datum/outfit/centcom/ert/marine
-	suit_store = /obj/item/gun/ballistic/automatic/cmg
-	belt = /obj/item/storage/belt/military/assault/full/cmg
-
-/datum/outfit/centcom/ert/marine/medic
-	suit_store = /obj/item/storage/belt/holster/detective/full/ert/skyrat
-
-/datum/outfit/centcom/ert/marine/engineer
-	suit_store = /obj/item/gun/ballistic/shotgun/automatic/as2
+/datum/outfit/centcom/ert/marine //commander
+	suit_store = /obj/item/gun/ballistic/automatic/ar/modular/m44a/grenadelauncher
+	belt = /obj/item/storage/belt/military/assault/full/m44a
+	back = /obj/item/mod/control/pre_equipped/marine
+	backpack_contents = list(
+		/obj/item/storage/box/survival/engineer/marine = 1,
+		/obj/item/melee/baton/security/loaded = 1,
+		/obj/item/storage/box/handcuffs = 1,
+		/obj/item/ammo_box/a40mm = 2, //gods must be strong
+	)
+	l_hand = null
+	r_hand = null
+	
+/datum/outfit/centcom/ert/marine/security //generic and/or heavy
+	suit_store = /obj/item/gun/ballistic/automatic/ar/modular/m44a/shotgun
+	belt = /obj/item/storage/belt/military/assault/full/m44a
+	back = /obj/item/mod/control/pre_equipped/marine
+	backpack_contents = list(
+		/obj/item/storage/box/survival/engineer/marine = 1,
+		/obj/item/melee/baton/security/loaded = 1,
+		/obj/item/storage/box/handcuffs = 1,
+		/obj/item/ammo_box/advanced/s12gauge/buckshot/marine = 2,
+	)
+	l_hand = null
+	r_hand = null
+	
+/datum/outfit/centcom/ert/marine/medic //medic
+	suit_store = /obj/item/gun/ballistic/automatic/ar/modular/m44a/scoped
+	belt = /obj/item/storage/belt/military/assault/full/m44a
+	back = /obj/item/mod/control/pre_equipped/marine
+	backpack_contents = list(
+		/obj/item/storage/box/survival/engineer/marine = 1,
+		/obj/item/reagent_containers/hypospray/combat = 1,
+		/obj/item/storage/medkit/regular = 1,
+		/obj/item/storage/medkit/advanced = 1,
+		/obj/item/sensor_device = 1,
+		/obj/item/pinpointer/crew/prox = 1,
+		/obj/item/stack/medical/gauze/twelve = 1,
+		/obj/item/reagent_containers/syringe = 1,
+		/obj/item/reagent_containers/glass/bottle/formaldehyde = 1,
+		/obj/item/stack/sticky_tape/surgical = 1,
+	)
+	l_hand = /obj/item/gun/medbeam
+	r_hand = null
+	
+/datum/outfit/centcom/ert/marine/engineer //engineer
+	suit_store = /obj/item/melee/hammer //doesn't need a rifle
+	back = /obj/item/mod/control/pre_equipped/marine/engineer
+	backpack_contents = list(
+		/obj/item/storage/box/survival/engineer/marine = 1,
+		/obj/item/ammo_box/magazine/smartgun_drum = 4, //AND WE'LL ALL STAY FREE
+	)
+	l_hand = null
+	r_hand = null
diff --git a/modular_skyrat/modules/modular_ert/code/marine_override/modified_gear.dm b/modular_skyrat/modules/modular_ert/code/marine_override/modified_gear.dm
index 0a19d762998..048f24ee35f 100644
--- a/modular_skyrat/modules/modular_ert/code/marine_override/modified_gear.dm
+++ b/modular_skyrat/modules/modular_ert/code/marine_override/modified_gear.dm
@@ -1,12 +1,19 @@
-/obj/item/storage/belt/holster/detective/full/ert/skyrat
+/obj/item/storage/belt/military/assault/full/m44a
 
-/obj/item/storage/belt/holster/detective/full/ert/skyrat/PopulateContents()
+/obj/item/storage/belt/military/assault/full/m44a/PopulateContents()
 	generate_items_inside(list(
-		/obj/item/gun/ballistic/automatic/pistol/firefly = 1,
-		/obj/item/ammo_box/magazine/multi_sprite/firefly = 2,
+		/obj/item/ammo_box/magazine/m44a = 6,
 	), src)
 
-/obj/item/storage/belt/military/assault/full/cmg/PopulateContents()
-	generate_items_inside(list(
-		/obj/item/ammo_box/magazine/multi_sprite/cmg/lethal = 6,
-	), src)
+/obj/item/ammo_box/advanced/s12gauge/buckshot/marine
+	w_class = WEIGHT_CLASS_NORMAL
+
+/obj/item/storage/box/survival/engineer/marine
+	name = "military survival box"
+	desc = "A box issued to Nanotrasen space marines, containing field essentials. This one is labelled to contain an extended-capacity tank."
+	illustration = "extendedtank"
+	internal_type = /obj/item/tank/internals/emergency_oxygen/engi
+
+/obj/item/storage/box/survival/engineer/marine/PopulateContents()
+	..()
+	new /obj/item/storage/crayons(src) //absolutely required
diff --git a/tgstation.dme b/tgstation.dme
index f63239e8fab..27e1b011b07 100644
--- a/tgstation.dme
+++ b/tgstation.dme
@@ -5497,7 +5497,10 @@
 #include "modular_skyrat\modules\mapping\code\turnstile.dm"
 #include "modular_skyrat\modules\mapping\code\vgdecals.dm"
 #include "modular_skyrat\modules\mapping\code\wardrobes.dm"
-#include "modular_skyrat\modules\marines\code\miscellaneous.dm"
+#include "modular_skyrat\modules\marines\code\gear.dm"
+#include "modular_skyrat\modules\marines\code\mod.dm"
+#include "modular_skyrat\modules\marines\code\modsuit_modules.dm"
+#include "modular_skyrat\modules\marines\code\smartgun.dm"
 #include "modular_skyrat\modules\medical\code\bodypart.dm"
 #include "modular_skyrat\modules\medical\code\bodypart_aid.dm"
 #include "modular_skyrat\modules\medical\code\carbon_defense.dm"