A: Probably. The Enhanced Battery Assist Lever sports a low-drag receiver-hugging contour and rounded corners everywhere, making it snag-free and comfortable to use. With the original Battery Assist Lever, we learned that not all lower receivers are created equally. Some (i.e. billet receivers) are wider than others. That is why we designed the Enhanced Battery Assist Lever with a Wide Receiver Relief - to provide a better fit on more lower receivers. Compatible with standard / mil-spec dimensioned, right-handed, AR15 / M16 upper and lower receivers, including the HK 416, Sig 516, Sig M400; and also the Cross Machine & Tool billet upper and lower receivers. May not be compatible with the Odin Works XMR Gen1 Extended Mag Release. Not compatible with the following weapons: FNH SCAR, S&W MP15-22, S&W MP15 Magpul Edition, Ruger SR-762, Sig 716; and may not be compatible with some 7.62 / .308 models.