The MK1 MOD 1-M line, redesigned for 2018, delivers unmatched reliability and performance with the proven PWS long-stroke piston system. Built to meet the demands of both civilians and law enforcement, this rifle retains the trusted internals that PWS owners rely on while incorporating modern upgrades for enhanced functionality. A free-float MLOK handguard provides versatility for accessory mounting, while forward assist controls and a refined mil-spec design ensure seamless operation. Fully forged upper and lower receivers create an incredibly durable and battle-ready platform, making the MK1 MOD 1-M a powerful choice for those who require a rifle that is built to perform under any conditions. PWS long stroke piston system, 3-setting adjustable gas regulator, allowing for fine-tuned adjustments to suit different ammunition types and performance needs The firearm is chambered in .223 Wylde, offering compatibility with both .223 Remington and 5.56 x 45mm cartridges The barrel length is 14-1/2 inches, offering a balanced combination of performance and portability The mid-length gas system provides a balanced cycling action, offering reliable performance and reduced recoil, making it a versatile option for various rifle configurations The barrel twist rate is 1:18, suitable for shooting lightweight bullets with greater precision Muzzle velocity 2921 fps, providing a higher velocity for improved long-range shooting No muzzle device included, all NFA rules apply, so ensure compliance when purchasing The PWS proprietary piston upper receiver is forged from T6 7075 aluminum and anodized for superior strength The PWS M-LOK 13.624 inches handguard offers the same 1.7 inches width and 2-1/4 inches height, providing more rail space for longer barreled setups and enhancing firearm customization The Radian Raptor ambidextrous charging handle provides smooth, reliable operation for both right and left handed users