...I don't really have that problem. After "correcting" the other people's carbines I ended up with a ton of spare parts at no cost except my time spent. I was going to use them to "correct" any carbines I bought , but I ended up buying ones that were correct anyway , so except for replacing the odd field replacement mag catch or safety , I did not use them for that. What I have done , though , is combed through them and pull any part that matched the ones on the bought carbines as far as markings AND finish. What was left over from each manufactorer was traded for spares that DID match. So I have a couple of each small parts for each of my carbines and I just don't have to worry about breakage.

Chris