VetteGirlMA
NES Member
So I tried taking my Karma AR bump fire stock and attaching it to my M&P sport. What I have discovered is that the pin end of the bump fire stock is larger in diameter than the hole that is in the rifle. Does this mean I am SOL and not able to use a bump fire on my rifle? I have the little pin and spring that is inside of the stock out, and I can tell from a manual test fit that it isn't going to fit. I was wondering what every else has done. Once I commit to using this stock like drilling out the tapped hole, that means the bump fire is going to be on there pretty much forever. Thanks in advance for any advice.