The Rock River Arms R9 Competition LAR-9 AR-15 style semi auto rifle is built on a set of forged aluminum upper and lower receivers. The lower is the LAR-9 lower with integral magawell, while the upper receiver is the forged aluminum A4 upper. This competition model function on a semi automatic blowback design and uses standard Colt SMG style magazines. This lightweight platform provides you with the ability to train on a standard AR-15 platform while shooting for the cost of a standard 9mm cartridge. You should expect accuracy to be around 1.5" and 50 yards.