The Primary Weapons Systems PWS MK1 MOD 2-M UPR 16" 762x39 BLK combines a refined long stroke piston system with innovative PicLok capability, offering a versatile platform that supports Picatinny or M-LOK accessories on the front of the firearm for quick accessory customization. This fully forged upper and lower receiver design showcases precision craftsmanship, while thoughtful omissions like the forward assist, combined with a flared mag well and integrated trigger guard, deliver a clean silhouette and enhanced ergonomics. Powered by PWSs long stroke piston system with a three-setting adjustable gas system, the MK1 MOD 2-M provides reliable operation across conditions, and its 16.1" barrel with mid-length gas delivers a balanced blend of velocity and maneuverability, complemented by a 1:8 twist rate and a FSC 556 muzzle device for controlled recoil and accuracy. The upper features PWSs proprietary piston upper in durable T6 7075 forged aluminum with anodized finish, matched to the sleek 15.0" PicLok handguard that preserves width and height for comfortable grip and accessory mounting, while the Radian Raptor ambidextrous charging handle ensures smooth operation from either shoulder.