The Br4 with an EMPIRE profile unthreaded barrel and a recessed barrel crown. This upper group compliments the firearm nicely and a lower group that accepts 5.56 AR mags. The 16.10" firearm features Remington 870 stock compatible,; cross-bolt safety; forward non-reciprocating side charger and proprietary Zeroed single stage trigger. Includes two Magpul 10rd PMAG magazines.