The Proof Research 6mm ARC 20" Stainless Steel Barrel, PR15, Medium Contour, 5/8x24 Threads, Silver is a precision-built AR-15 barrel designed for shooters who demand consistent accuracy and dependable performance. Machined from double stress-relieved 416R stainless steel with a carefully lapped bore, it pairs a 20-inch medium contour profile with a 1:7.5 twist to stabilize modern high-BC 6mm ARC projectiles while maintaining excellent rigidity.
This threaded 5/8x24 barrel uses a rifle-length gas system and a 0.750" gas block journal, making it compatible with a wide range of AR-15 components and muzzle devices. Its stainless finish and approximately 3.2 lb weight strike a balance between durability and manageable handling for precision gas-gun builds, extended range sessions, and practical competition use. Backed by Proof Research’s focus on repeatability and quality, this barrel is built to help shooters get the most out of the 6mm ARC cartridge.
- Manufacturer: Proof Research
- Model: 6mm ARC 1-7.5 Twist 20" Stainless Steel Barrel, PR15
- Caliber: 6mm ARC
- Barrel Length: 20.00 Inches
- Barrel Finish: Stainless
- Barrel Contour: Medium
- Gas System Length: Rifle
| __Twist Rate | 1:7.5 |
| __Rifling | Cut Rifled |
| __Material | 416R Stainless Steel |
| __Barrel Length | 20.00" |
| __Model | PR15 Stainless Steel Barrel |
| __Caliber | 6mm ARC |
| __Capacity | NA |
| __Optic Footprint | NA |
| __Action | NA |
