The CMMG AR Conversion Kit drops into a standard 5.56/223 AR-15 upper and turns it into a .22 LR trainer without any tools or permanent changes. The kit replaces the bolt carrier with a dedicated rimfire carrier that works with standard AR buffers and springs, so you keep your familiar trigger, stock, and grip while feeding cheap rimfire ammo. It's a fast way to run drills, practice trigger presses, and put newer shooters behind your rifle without burning through 5.56.

This package includes the AR conversion bolt, a full-body magazine that drops into the AR-15 magwell like a standard mag, and CMMG's stainless steel construction for long service life. The conversion is ideal for high-volume plinking, dry-fire practice with live rounds, and introducing kids or new shooters to the AR platform. To go back to centerfire, simply swap the bolt carrier and magazine — your host rifle stays unmodified. FDE finish on the kit blends with a range of AR builds.