To test which problem you have, fabricate a spacer to go in the bottom of the lug slot. If the spacer makes the gun tight, you may want to get a new bolt. If it does not make it tight, fabricate a spacer for the loop. If that makes it tight, you may need a new pin or a more permanent spacer. If you don't want to do these things, send it to Tony. He will do a good job, permanently. Your gun must have had an interesting life. I have not yet had a loose 21. To answer your original question, I would suspect thay made the pin harder than the hook, but the pin is easier to replace for adjustment. Bill Murphy
