Product Overview
PROOF designed their AR barrels with the goal of improving performance and reliability in the AR platform. The Caliber Matched Gas System (CAMGAS) results in a gas system that is tuned specifically for the cartridge and length of the barrel. The AR-15 Platform was originally designed around the 223REM and 5.56NATO cartridges and the AR-10 was designed around the 308 Win/7.62NATO round. With higher performance cartridge such as the 6.5 Creedmoor; 6 ARC; and 22 ARC; the bore pressure remains higher further down the barrel.
By moving the port location; the gas system pressure is the same as how the AR platforms were originally designed. The result is a recoil impulse that is noticeably softer; less fouling in the receiver; increased reliability of extraction; and less wear and tear on brass. This helps keep you on target and shooting while taking advantage of the latest high-performance cartridges.
* Barrels are guaranteed for headspacing to the specifications of the JP Enterprise Enhanced Bolt.
* It is recommended to double check and ensure proper headspace before firing your rifle.
* Use of full mass components throughout (full mass bolt; buffer; and springs) is recommended.
* All barrels with Intermediate; Rifle +1; Rifle +2; and Rifle +3 gas systems include the proper gas tube.
* 6 ARC Disclaimer – There is no guarantee of optimal cycling performance with factory ammunition weighing under 100 grains.
* 6.5 Grendel; 22 ARC; and 6 ARC barrels are designed for operation using a Grendel Type II bolt.
By moving the port location; the gas system pressure is the same as how the AR platforms were originally designed. The result is a recoil impulse that is noticeably softer; less fouling in the receiver; increased reliability of extraction; and less wear and tear on brass. This helps keep you on target and shooting while taking advantage of the latest high-performance cartridges.
* Barrels are guaranteed for headspacing to the specifications of the JP Enterprise Enhanced Bolt.
* It is recommended to double check and ensure proper headspace before firing your rifle.
* Use of full mass components throughout (full mass bolt; buffer; and springs) is recommended.
* All barrels with Intermediate; Rifle +1; Rifle +2; and Rifle +3 gas systems include the proper gas tube.
* 6 ARC Disclaimer – There is no guarantee of optimal cycling performance with factory ammunition weighing under 100 grains.
* 6.5 Grendel; 22 ARC; and 6 ARC barrels are designed for operation using a Grendel Type II bolt.
| 16” 6 ARC Carbon Fiber | 18” 6 ARC Carbon Fiber | 16” 6 ARC Steel | 18” 6 ARC Steel | |
| SKU | 128657 | 128671 | 128664 | 128688 |
| Barrel Length | 16″ | 18″ | 16″ | 18″ |
| Twist Rate | 1:7.5 | 1:7.5 | 1:7.5 | 1:7.5 |
| Gas Length | Rifle | Rifle+1 | Rifle | Rifle+1 |
| Gas Journal | .750 | .750 | .750 | .750 |
| Port Size | .096 | .096 | .096 | .096 |
| Muzzle Thread | 5/8×24 | 5/8×24 | 5/8×24 | 5/8×24 |
| Weight | 1lb 12oz | 1lb 14oz | 2lb 12oz | 2lb 14oz |
