re-introduces muzzle los check

code/modules/vehicles/hardpoints/hardpoint.dm

@@ -300,14 +300,12 @@
 
 	return data
 
-/*
-// Traces backwards from the gun origin to the vehicle to check for obstacles between the vehicle and the muzzle
-/obj/item/hardpoint/proc/clear_los(atom/A)
-
+/// Traces backwards from the gun origin to the vehicle to check for obstacles between the vehicle and the muzzle.
+/obj/item/hardpoint/proc/clear_los()
 	if(origins[1] == 0 && origins[2] == 0) //skipping check for modules we don't need this
 		return TRUE
 
-	var/turf/muzzle_turf = locate(owner.x + origins[1], owner.y + origins[2], owner.z)
+	var/turf/muzzle_turf = get_origin_turf()
 
 	var/turf/checking_turf = muzzle_turf
 	while(!(owner in checking_turf))
@@ -316,31 +314,30 @@
 			return FALSE
 
 		// Ensure that we can pass over all objects in the turf
-		for(var/obj/O in checking_turf)
+		for(var/obj/object in checking_turf)
 			// Since vehicles are multitile the
-			if(O == owner)
+			if(object == owner)
 				continue
 
 			// Non-dense objects are irrelevant
-			if(!O.density)
+			if(!object.density)
 				continue
 
 			// Make sure we can pass object from all directions
-			if(!(O.pass_flags.flags_can_pass_all & PASS_OVER_THROW_ITEM))
-				if(!(O.flags_atom & ON_BORDER))
+			if(!HAS_FLAG(object.pass_flags.flags_can_pass_all, PASS_OVER_THROW_ITEM))
+				if(!HAS_FLAG(object.flags_atom, ON_BORDER))
 					return FALSE
 				//If we're behind the object, check the behind pass flags
-				else if(dir == O.dir && !(O.pass_flags.flags_can_pass_behind & PASS_OVER_THROW_ITEM))
+				else if(dir == object.dir && !HAS_FLAG(object.pass_flags.flags_can_pass_behind, PASS_OVER_THROW_ITEM))
 					return FALSE
 				//If we're in front, check front pass flags
-				else if(dir == turn(O.dir, 180) && !(O.pass_flags.flags_can_pass_front & PASS_OVER_THROW_ITEM))
+				else if(dir == turn(object.dir, 180) && !HAS_FLAG(object.pass_flags.flags_can_pass_front, PASS_OVER_THROW_ITEM))
 					return FALSE
 
 		// Trace back towards the vehicle
 		checking_turf = get_step(checking_turf, turn(dir,180))
 
 	return TRUE
-*/
 
 //-----------------------------
 //------INTERACTION PROCS----------
@@ -613,6 +610,10 @@
 		to_chat(user, SPAN_WARNING("<b>The target is not within your firing arc!</b>"))
 		return NONE
 
+	if(!clear_los())
+		to_chat(user, SPAN_WARNING("<b>The muzzle is obstructed!</b>"))
+		return NONE
+
 	return handle_fire(target, user, params)
 
 /// Actually fires the gun, sets up the projectile and fires it.