FYI, many times you don't have to shave the Tapco hammer. Shoot it enough and it will wear exactly how it needs to be. When I first installed mine, it would hang open if you pulled the charging handle back very slowly, but the slightest bump would let it slam shut again. During shooting I never had it hang open once, so give it a function test before modifying it.
As far as other modifications, You may need to file a little bit in front of the trigger itself, right where it meets flush with the bottom of the receiver. Also, if you order a double hook (a lot of times they are cheaper) yo
