projectiles can pass

code/__DEFINES/flags.dm

@@ -103,6 +103,7 @@
 #define PASSBLOB		8
 #define PASSMOB			16
 #define LETPASSTHROW	32
+#define PASSFENCE		64
 
 //turf-only flags
 #define NOJAUNT		1

code/game/objects/structures/fence.dm

@@ -26,12 +26,10 @@
 
 /obj/structure/fence/Initialize()
 	. = ..()
-
 	update_cut_status()
 
 /obj/structure/fence/examine(mob/user)
 	. = ..()
-
 	switch(hole_size)
 		if(MEDIUM_HOLE)
 			. += "There is a large hole in \the [src]."
@@ -58,6 +56,13 @@
 	icon_state = "straight_cut3"
 	hole_size = LARGE_HOLE
 
+/obj/structure/fence/CanPass(atom/movable/mover, turf/target)
+	if(istype(mover) && mover.checkpass(PASSFENCE))
+		return TRUE
+	if(!density)
+		return TRUE
+	return FALSE
+
 // shock user with probability prb (if all connections & power are working)
 // returns 1 if shocked, 0 otherwise
 // Totally not stolen from code\game\objects\structures\grille.dm

code/game/objects/structures/railings.dm

@@ -5,6 +5,7 @@
 	icon_state = "railing"
 	density = TRUE
 	anchored = TRUE
+	pass_flags = LETPASSTHROW
 	climbable = TRUE
 	layer = ABOVE_MOB_LAYER
 	var/currently_climbed = FALSE
@@ -64,6 +65,8 @@
 	return TRUE
 
 /obj/structure/railing/CanPass(atom/movable/mover, turf/target)
+	if(istype(mover) && mover.checkpass(PASSFENCE))
+		return TRUE
 	..()
 	var/mob/living/M = mover
 	if(M.flying || M.floating || mover.throwing)
@@ -73,10 +76,11 @@
 	return TRUE
 
 /obj/structure/railing/corner/CanPass()
-	..()
 	return TRUE
 
 /obj/structure/railing/CheckExit(atom/movable/O, target)
+	if(istype(O) && O.checkpass(PASSFENCE))
+		return TRUE
 	var/mob/living/M = O
 	if(M.flying | M.floating)
 		return TRUE

code/modules/assembly/infrared.dm

@@ -215,7 +215,7 @@
 	var/life_cycles = 0
 	var/life_cap = 20
 	anchored = TRUE
-	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE | PASSFENCE
 
 
 /obj/effect/beam/i_beam/proc/hit()

code/modules/projectiles/guns/alien.dm

@@ -70,7 +70,7 @@
 	damage = 60
 	damage_type = BRUTE
 	flag = "bullet"
-	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE | PASSFENCE
 
 	weaken = 5
 	stun = 5

code/modules/projectiles/guns/medbeam.dm

@@ -81,7 +81,7 @@
 	if(!istype(user_turf))
 		return 0
 	var/obj/dummy = new(user_turf)
-	dummy.pass_flags |= PASSTABLE & PASSGLASS & PASSGRILLE //Grille/Glass so it can be used through common windows
+	dummy.pass_flags |= PASSTABLE & PASSGLASS & PASSGRILLE & PASSFENCE //Grille/Glass so it can be used through common windows
 	for(var/turf/turf in getline(user_turf,target))
 		if(turf.density)
 			qdel(dummy)

code/modules/projectiles/projectile/beams.dm

@@ -1,7 +1,7 @@
 /obj/item/projectile/beam
 	name = "laser"
 	icon_state = "laser"
-	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE | PASSFENCE
 	damage = 20
 	damage_type = BURN
 	hitsound = 'sound/weapons/sear.ogg'

code/modules/projectiles/projectile/bullets.dm

@@ -6,6 +6,7 @@
 	flag = "bullet"
 	hitsound_wall = "ricochet"
 	impact_effect_type = /obj/effect/temp_visual/impact_effect
+	pass_flags = PASSFENCE
 
 /obj/item/projectile/bullet/weakbullet //beanbag, heavy stamina damage
 	name = "beanbag slug"

code/modules/projectiles/projectile/energy.dm

@@ -5,6 +5,7 @@
 	damage_type = BURN
 	flag = "energy"
 	is_reflectable = TRUE
+	pass_flags = PASSFENCE
 
 /obj/item/projectile/energy/electrode
 	name = "electrode"

code/modules/projectiles/projectile/magic.dm

@@ -6,6 +6,7 @@
 	nodamage = 1
 	armour_penetration = 100
 	flag = "magic"
+	pass_flags = PASSFENCE
 
 /obj/item/projectile/magic/death
 	name = "bolt of death"

code/modules/projectiles/projectile/special.dm

@@ -53,7 +53,7 @@
 	nodamage = 1
 	flag = "energy"
 	var/temperature = 300
-	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE | PASSFENCE
 
 /obj/item/projectile/temp/New(loc, shot_temp)
 	..()