Bushmaster Bravo Zulu Upper Assembly 20in 450BM Black 00-40009-BLK. This upper assembly features an barrel made from 4150 CMV steel finished with a Salt Bath Nitride treatment for improved durability and corrosion resistance. The barrel boasts a...
Bushmaster Bravo Zulu Upper Assembly 20in 450BM Black 00-40009-BLK. This upper assembly features an barrel made from 4150 CMV steel finished with a Salt Bath Nitride treatment for improved durability and corrosion resistance. The barrel boasts a...