Fixes loading ammo for the L6-SAW (#26370)

code/modules/projectiles/guns/ballistic/automatic.dm

@@ -333,10 +333,7 @@
 
 
 /obj/item/weapon/gun/ballistic/automatic/l6_saw/attackby(obj/item/A, mob/user, params)
-	. = ..()
-	if(.)
-		return
-	if(!cover_open)
+	if(!cover_open && istype(A, mag_type))
 		to_chat(user, "<span class='warning'>[src]'s cover is closed! You can't insert a new mag.</span>")
 		return
 	..()