Mostly ports Bay's plasma pulse stunner

code/modules/projectiles/guns/energy/stun.dm

@@ -55,3 +55,14 @@
 	force = 10
 	matter = list(DEFAULT_WALL_MATERIAL = 200000)
 	projectile_type = /obj/item/projectile/energy/bolt/large
+
+/obj/item/weapon/gun/energy/plasmastun
+	name = "plasma pulse projector"
+	desc = "The Mars Military Industries MA21 Selkie is a weapon that uses a laser pulse to ionise the local atmosphere, creating a disorienting pulse of plasma and deafening shockwave as the wave expands."
+	icon_state = "plasma_stun"
+	item_state = "plasma_stun"
+	fire_sound = 'sound/weapons/blaster.ogg'
+	origin_tech = list(TECH_COMBAT = 2, TECH_MATERIAL = 2, TECH_POWER = 3)
+	fire_delay = 20
+	charge_cost = 600
+	projectile_type = /obj/item/projectile/energy/plasmastun

code/modules/projectiles/projectile/energy.dm

@@ -133,3 +133,50 @@
 	light_range = 2
 	light_power = 0.5
 	light_color = "#33CC00"
+
+/obj/item/projectile/energy/plasmastun
+	name = "plasma pulse"
+	icon_state = "plasma_stun"
+	armor_penetration = 10
+	kill_count = 4
+	damage = 5
+	agony = 70
+	damage_type = BURN
+//	vacuum_traversal = 0	//Projectile disappears in empty space, TODO: Implement this
+
+/obj/item/projectile/energy/plasmastun/proc/bang(var/mob/living/carbon/M)
+
+	to_chat(M, "<span class='danger'>You hear a loud roar.</span>")
+	playsound(M.loc, 'sound/effects/bang.ogg', 50, 1)
+	var/ear_safety = 0
+	var/mob/living/carbon/human/H = M
+	if(iscarbon(M))
+		if(ishuman(M))
+			if(istype(H.l_ear, /obj/item/clothing/ears/earmuffs) || istype(H.r_ear, /obj/item/clothing/ears/earmuffs))
+				ear_safety += 2
+			if(HULK in M.mutations)
+				ear_safety += 1
+			if(istype(H.head, /obj/item/clothing/head/helmet))
+				ear_safety += 1
+	if(ear_safety == 1)
+		M.Weaken(2)
+	else if (ear_safety > 1)
+		M.Weaken(1)
+	else if (!ear_safety)
+		M.Stun(10)
+		M.Weaken(3)
+		M.ear_damage += rand(1, 10)
+		M.ear_deaf = max(M.ear_deaf,15)
+	if (M.ear_damage >= 15)
+		to_chat(M, "<span class='danger'>Your ears start to ring badly!</span>")
+		if (prob(M.ear_damage - 5))
+			to_chat(M, "<span class='danger'>You can't hear anything!</span>")
+			M.sdisabilities |= DEAF
+	else
+		if (M.ear_damage >= 5)
+			to_chat(M, "<span class='danger'>Your ears start to ring!</span>")
+	M.update_icons()
+
+/obj/item/projectile/energy/plasmastun/on_hit(var/atom/target)
+	bang(target)
+	. = ..()