Better than troy, bad lever and other similar options - Phase 5 Weapon Systems Inc Extended Bolt Release V3

I love these things. I've purchased two of them after first buying the Troy version which clamps on to your milspec bolt catch using a set screw that comes lose over time and usage. This phase 5 version completely replaces your milspec bolt catch eliminating any play or potential loosening and looks a lot cooler at the same time. You will need a vice, AR lower vice block and a proper size roll pin starter punch or your local gunsmith.