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

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.