These upper receivers and magazines are designed specifically for the 6mm BR family of cartridges. The upper receivers mount directly to your existing AR-15 lower receiver without modifications. The upper receivers were designed in conjunction with Olympic Arms. The magazines are a joint development effort between BR Armament Technologies and C Products LLC.

BRX Upper Receiver w/28" barrel and RPA Tall Boy sight

     AR-15 Bolt                 BR15 Bolt                        200-13x Fired w/BRX 100yds at LGC VA

This upper receiver assembly has been specifically designed to use the BR family of cartridges. It has a larger bolt,  modified bolt carrier,  modified upper receiver,  a larger barrel extension, and most importantly an all new magazine designed specifically to handle the BR class of cartridges. All other parts are standard AR15.