Function good - damaged my bca 300blk upper - Geissele Maritime Bolt Catch

This installed and functions well. My son has several and really likes them as why I tried this. One caveat and the star off, the 'flying boat tail', to the right of the upper release button as you look at the release straight on, is very wide. It was catching on the metal housing of the upper mentioned. That upper is a side charging handle upper and as such has some extra wide metal in the bolt catch/release button spot. They mill out quite a bit extra in this spot for this reason, but even with that larger opening, this extra piece on the right top still rubbed on the metal and damanged/caused metal shavings. I thought I had a bad bolt but it was this all along. When I swapped this back out for the OEM release the problem was resolved. Beware what firearm you put it on. It works well on my PSA AR 15 frame uppers, just not the side charging handle one.