AR-15 & AR-10 Compatibility: Uppers, Lowers, Bolts, & Barrels

Learn what lowers and uppers are compatible with our AR-15 and AR-10 complete upper assemblies and lower receivers. As you&probably discovered, AR-15s can shoot a whole lot more than just 5.56 NATO: 300 Blackout, 350 Legend, 7.62x39, 458 SOCOM, and 6.5 Grendel to name a few. Thus, Lemar explains how to change the caliber of your AR-15 and what bolts will work with which round. Our AR-15 rifles, uppers, and components and are compatible with other mil-spec parts, and our AR-10s are DPMS Low Profile Gen-1 style. Comment your next Bear Creek Arsenal build below! Timeline 0:00 AR-10 Compatibility 0:55 AR-15 Upper/Lower Compatibility 2:35 How to Change Calibers 3:24 AR-15 Bolt Compatibility NEW VIDEO PLATFORM! ⤵️ Follow us on: