The Juggernaut Tactical JTHCAPK308 Hellfighter Mod Kit provides an ultra-fast and Californian-compliant magazine lock solution for your AR-10 or AR-15. Utilizing Juggernaut\'s modified quick-release take down pin, it serves as a button to detach the upper from the lower just enough to cease semi-automatic operation and deactivate the magazine lock instantly.Once the upper portion is separated and semi-automatic operation is halted, your magazine release becomes functional. A quick tap reconnects the upper and reactivates the spring-loaded take down pin, returning you swiftly to action. It permits the retention of all your current features, encompassing a pistol grip, a forward grip, and an adjustable butt stock. You also have the advantage of being able to reinstall a mil-spec magazine release.This model, in sleek black finish, is compatible with your AR-15.