The Primary Weapons Systems MK114 Mod 2-M 14-1/2 inches Railed Upper is engineered for precision and reliability, featuring a .223 Wylde chamber that accommodates both .223 Remington and 5.56x45mm ammunition. The 1:8 twist rate optimizes bullet stabilization for a wide range of projectile weights, enhancing accuracy and performance. This upper assembly is designed with a mid-length gas system, providing a balanced recoil impulse and improved cycling reliability. The 14-1/2 inches barrel is constructed from high-quality materials to ensure durability and longevity. The railed upper allows for versatile accessory attachment, catering to various operational needs. Note that this configuration does not include a Bolt Carrier Group (BCG) or charging handle (CH), allowing users to customize these components to their specific requirements. Operating system - PWS long stroke piston system featuring a 3-setting adjustable gas system Gas system configuration - mid-length Muzzle velocity is 2921 fps PWS proprietary piston upper, constructed from 7075-T651 aluminum alloy, featuring a hardcoat anodized finish in accordance with MIL-A-8625, type III, class 2 specifications Handguard specification - PWS PicLok 13.574 inches handguard (width - 1.7 inches, height: 2-1/4 inches) Radian Raptor ambidextrous charging handle Muzzle device is PWS FSC 556 (permanently affixed via pinning and welding) or absence of a muzzle device Compliance with all National Firearms Act (NFA) regulations is mandatory