we don't need these with the istype checks

code/modules/projectiles/guns/alien.dm

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

code/modules/projectiles/projectile/beams.dm

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

code/modules/projectiles/projectile/bullets.dm

@@ -6,7 +6,6 @@
 	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

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

code/modules/projectiles/projectile/magic.dm

@@ -6,7 +6,6 @@
 	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 | PASSFENCE
+	pass_flags = PASSTABLE | PASSGLASS | PASSGRILLE
 
 /obj/item/projectile/temp/New(loc, shot_temp)
 	..()