The Proof Research 128688 AR-Style Barrel, 6mm ARC, 18.00" Threaded Barrel, Stainless is a purpose-built upgrade for shooters who want match-grade performance from an AR-15 platform. Machined from 416R stainless steel with a medium contour and 18-inch length, this PR15 barrel uses a rifle +1 gas system and 5/8x24 threaded muzzle to deliver smooth cycling and easy compatibility with brakes, comps, or suppressors.
This stainless 6mm ARC barrel is ideal for precision-focused AR builds used for extended-range target shooting, practical competition, or hunting where a balance of velocity and maneuverability matters. The fast 1:7.5 twist and 4-groove cut rifling stabilize modern high-BC 6mm bullets, while Proof’s CAMGAS system tunes gas flow for a softer recoil impulse and reliable extraction. It reflects Proof Research’s reputation for meticulous craftsmanship, durability, and repeatable accuracy.
- Manufacturer: Proof Research
- Model: PR15 AR-Style Barrel
- Caliber: 6mm ARC
- Barrel Length: 18"
- Twist Rate: 1:7.5
- Gas System Length: Rifle +1
- Gas Journal Diameter: 0.750"
| __Twist Rate | 1:7.5 |
| __Rifling | Cut Rifled |
| __Material | 416R Stainless Steel |
| __Caliber | 6mm ARC |
| __Barrel Length | 18.00" |
| __Capacity | NA |
| __Model | PR15 |
| __Optic Footprint | NA |
| __Action | NA |
