It's a great bolt catch/release - Geissele Maritime Bolt Catch

First off this thing functions beautifully and it is as easy to install as any bolt catch/release out there. That being said, I underestimated just how big this was which is entirely my fault. I installed it on a new AR15 build that I did and the catch portion at the bottom goes down so far that it almost obstructs my mag release from working. It's actually difficult to differentiate between my ambidextrous mag release and the bottom tab on this. As a result I'll likely be putting it on something else that's bigger.