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.
- Match-grade accuracy
- Unprecedented durability
- Double-stress relieved 416R stainless steel
- Single point cut rifled and twice hand lapped
Cartridge 6mm Advanced Rifle Cartridge (6mm ARC) Finish Stainless Material Stainless Steel Length 16 Inches Weight 2.75 Pound Twist 1:7.5 Threads 5/8″-24 Barrel Contour Heavy Chrome Lined No Gas System Length Rifle Gas Block Diameter 0.75 Inches M4 Feed Ramps Yes Country of Origin United States of America Compatible WithAR-15