AR45 Blowback Upper Builders Kit
A limited time offer! Builders kit including our 45ACP barrel, bolt, and 10 ounce heavy extended buffer
- 1/16 twist, 4140 CM black nitride barrel
- Colt pattern ramped bolt
- 10 oz. extended length steel bodied carbide filled buffer.
- engineered to run with all currently available large frame Glock lowers