Updated Projectile code some more.

code/game/machinery/_machinery.dm

@@ -90,7 +90,7 @@ Class Procs:
 	verb_say = "beeps"
 	verb_yell = "blares"
 	pressure_resistance = 15
-	pass_flags_self = PASSMACHINE	
+	pass_flags_self = PASSMACHINE
 	max_integrity = 200
 	layer = BELOW_OBJ_LAYER //keeps shit coming out of the machine from ending up underneath it.
 	flags_1 = DEFAULT_RICOCHET_1
@@ -449,6 +449,12 @@ Class Procs:
 		update_icon()
 		updateUsrDialog()
 
+/obj/machinery/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
+
+	if(mover.pass_flags & PASSMACHINE)
+		return TRUE
+
 /obj/machinery/proc/default_deconstruction_screwdriver(mob/user, icon_state_open, icon_state_closed, obj/item/I)
 	if(!(flags_1 & NODECONSTRUCT_1) && I.tool_behaviour == TOOL_SCREWDRIVER)
 		I.play_tool_sound(src, 50)

code/game/machinery/doors/door.dm

@@ -129,6 +129,8 @@
 
 /obj/machinery/door/CanAllowThrough(atom/movable/mover, turf/target)
 	. = ..()
+	if(.)
+		return
 
 	// Snowflake handling for PASSGLASS.
 	if(istype(mover) && (mover.pass_flags & PASSGLASS))

code/game/machinery/doors/windowdoor.dm

@@ -134,7 +134,7 @@
 	return !density || (dir != to_dir) || (check_access(ID) && hasPower())
 
 /obj/machinery/door/window/CheckExit(atom/movable/mover, turf/target)
-	if((pass_flags_self & mover.pass_flags)) || ((pass_flags_self & LETPASSTHROW) && mover.throwing))
+	if((pass_flags_self & mover.pass_flags) || ((pass_flags_self & LETPASSTHROW) && mover.throwing))
 		return TRUE
 	if(get_dir(loc, target) == dir)
 		return !density