This Proof Research AR-style barrel is chambered in 6mm ARC with an 18-inch rifle length gas system, 1:7.5 twist and 4 grooves. It is stainless steel with a 5/8-24 thread.
- Manufacturer Part # : 128688
- Type : AR-Style Barrel
- Caliber : 6mm ARC
- Length : 18"
- Gas System : Rifle Length
- Grooves : 4
- Thread : 5/8-24
- Finish : Stainless
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