Having had my cmmg resolute for about a year (thanks Buds!!) And being a lefty, I've come to appreciate cmmg's zeroed line of ambi parts. So much so that I wanted to use this bolt catch on my 2 other AR guns. The wider paddle on the bottom allows a lefty to use their right hand which is holding the front of the gun to just wrap around the magwell and push down on it. Can't do that with with little nub of a std bolt catch. Btw, It doesn't interfere with the cmmg ambi mag release nor I'd imagine the Troy or other ambi versions of mag release that are right above this bolt catch