This 223 Rem ammo by PMC is brass case, boxer primed reloadable and non-corrosive. A great ammunition option for AR-15 and other semi auto rifle enthusiasts. PMC, Precision Made Cartridges, brings you, the shooter, the quality, dependability and accuracy you have come to expect from world-class ammunition. Reliable performance from serious competition to casual paper punching PMC Bronze Line ammunition makes it possible for recreational shooters and riflemen to enjoy high performance velocity and accuracy in a cost-effective cartridge.