This works great and yet not obvious - POF USA Universal Bolt Catch Black Anodized 00667P

I like these, I have them on all my AR-15 platform firearms. The release tab is wide enough to work better without being in the way or an eyesore. And they work just fine. The mil-spec releases get to working on your fingers after long days of shooting. These do not do that. The little pad is wide enough to worke great and is easy to find when your not looking at it. Fit was great, as well as the finish. And they are easy enough to install. On mine I dive the hold-in pin out enough to get the old one out and new one in. I am happy with these and highly recommend them.