Proof Research Barrel AR-15 6.5 Grendel 20" Rifle Length 1 in 8" Twist Stainless Steel

Proof Research's steel barrels are produced in-house from double-stress relieved 416R stainless steel. This pre-hardened chromium steel is ideally suited for match grade rifle barrels. Each barrel is drilled, contoured and reamed to bore diameter. It is then cut rifled, lapped, and inspected via borescope. This ensures an extremely consistent and accurate finished product. ;Features Match-grade accuracy Unprecedented durability Double-stress relieved 416R stainless steelSingle point cut rifled and twice hand lapped- Length: 20 Inches - Caliber: 6.5 Grendel - Twist: 1:8 - Threads: 5/8-24 - Contour: Medium - Chrome Lined: No - Gas Block Diameter: 0.75 Inches - Gas System Length: Rifle - M4 Feed Ramps: Yes