4150 Mil-B-11595 chrome-moly vanadium alloy (machine gun rated) barrel with 5R polygonal right handed 1x8 twist hand-lapped button rifled from Rock Creek Barrels, Inc. POF-USA triple port muzzle device. Gas piston operated, rotating bolt (short stroke system), 2-position gas plug for normal (N) or suppressed (S) operating modes. Upper Receiver: POF-USA M.R.R. Modular Railed Receiver, billet machined 7075-T6 aircraft aluminum alloy. 2-piece upper receiver with free floating monolithic top rail. Oversized heat sink barrel nut. A3 flattop upper receiver. Lower Receiver: P-415, Gen III billet machined 7075-T6 aircraft aluminum alloy with integral oversized trigger guard, Tactical integrated trigger system 4.5 pound non-adjustable single stage competition trigger group. KNS anti-walk pins. Magpul MOE grip and CTR buttstock.
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