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The Proof Research PR15 is a stainless steel AR-15 barrel chambered in 6mm ARC. It is 22 inches long with a 1:7.5 twist and a rifle-plus-one gas system length, and the muzzle is threaded 5/8×24.
- Manufacturer Part # : 143674
- Type : AR-15 Barrel
- Caliber : 6mm ARC
- Barrel Length : 22″
- Gas System : Rifle +1 Length
- Material : Stainless Steel
- Thread Pitch : 5/8×24
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