sanity check

code/datums/components/crafting/recipes/recipes_weapon_and_ammo.dm

@@ -10,7 +10,7 @@
 
 /datum/crafting_recipe/pin_removal/check_requirements(mob/user, list/collected_requirements)
 	var/obj/item/gun/G = collected_requirements[/obj/item/gun][1]
-	if (G.no_pin_required)
+	if (G.no_pin_required || !G.pin)
 		return FALSE
 	return TRUE
 

code/modules/projectiles/gun.dm

@@ -79,8 +79,11 @@
 
 /obj/item/gun/Initialize()
 	. = ..()
-	if(pin && !no_pin_required)
-		pin = new pin(src)
+	if(pin)
+		if(no_pin_required)
+			pin = null
+		else
+			pin = new pin(src)
 	if(gun_light)
 		alight = new (src)
 	if(zoomable)