The MK1 MOD 1-M line, redesigned for 2018, continues to set the standard for durability and performance with the renowned PWS long-stroke piston system. Built on the trusted foundation that PWS owners have come to rely on, this rifle combines battle-proven reliability with modern enhancements. A free-float MLOK handguard provides exceptional versatility for accessory mounting, while forward assist controls and a refined mil-spec design ensure seamless operation in any environment. Fully forged upper and lower receivers create an incredibly strong and dependable platform, making this rifle a top choice for both civilians and law enforcement professionals. Designed to excel under the most demanding conditions, the MK1 MOD 1-M delivers unstoppable performance with uncompromising quality. 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 16.1 inches, delivering versatility and enhanced accuracy for various applications 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 2980 fps, offering consistent speed and precision for effective shooting Muzzle device PWS FSC 556, designed to reduce recoil and muzzle rise for improved shooting control The PWS proprietary piston upper receiver is forged from T6 7075 aluminum and anodized for superior strength The PWS M-LOK 15.05 inches handguard maintains a 1.7 inches width and 2-1/4 inches height, offering even more space for accessory mounting and optimal control with extended length configurations The Radian Raptor ambidextrous charging handle provides smooth, reliable operation for both right and left handed users