I would bet you could contact Night owl enterprises and reference the drawing numbers and buy all the lugs you can afford. I have never seen a CNC shop that very got rid of a program. I don't believe the welding is a big issue as long as the preheat and cool down is done properly. H&R welds these up every day. The only thing I have noticed is (on the Handis I have) is that there has been a flat ground on the barrel where the lug is attached.