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Primary Weapons 18-M116RA1B: The MK1 MOD 1-M line offers the tried-and-true system that PWS owners have grown to know and love. With a truer to mil-spec design, the MK1 MOD 1-M line is a go-to for Law Enforcement and Military Individuals. It is a no-nonsense tool that is relentless and unstoppable. Features: • Only Long Stroke Piston System on the market • Fully Forged Upper and Lower receiver • Forward Assist controls • Free Float MLOK handguard Specs: • Barrel Length 16.1” • Barrel Twist 1:8 • Caliber 223 Wylde • Mid-length gas system