For anyone wondering, yes the Gen 2 bolt release button and latch fit the original 1301 comp with no gunsmith work. It's kind of tricky to put in without marking up the receiver, but I managed to not put a single scratch on it. There is a plastic cover that goes over the lever, but I screwed mine up trying to take it off. I wanted to make sure that the original latch sat the same way this one did. Almost like it better without the plastic cover. It's all steel. Got the parts from Midwest gun works. Part #C8D464 for the button and latch assembly, #C5H273 for the plastic cover. You could probably get away with just replacing the button itself #C5G371 with the cover. I just wanted a solution that didn't rattle around like the bolt release shrouds. Also, no screws to back out as it's one piece.