maybe this will work

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

@@ -8,6 +8,13 @@
 	category = CAT_WEAPONRY
 	subcategory = CAT_WEAPON
 
+/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)
+		to_chat(user, "<span class='notice'>You can't seem to figure out how to remove a pin from this weapon.</span>")
+		return FALSE
+	return TRUE
+
 /datum/crafting_recipe/strobeshield
 	name = "Strobe Shield"
 	result = /obj/item/assembly/flash/shield