Founded in 2008 by dedicated firearm enthusiasts, Primary Weapons Systems began by designing and manufacturing advanced muzzle devices. Through extensive testing on a wide range of rifles, from M4s to AK-47s, the team observed a striking difference in maintenance requirements after sustained high-round-count use. This discovery led to the development of the PWS long-stroke piston system, which preserves the core functionality of the AR-15 while significantly reducing maintenance needs in high-volume shooting and harsh environments. The Compound Rifle showcases this innovation, combining a Mod 1 upper with the MK1 Mod 2 lower to deliver exceptional reliability, durability and performance for demanding shooters.

Operating system PWS long stroke piston system with a 3-setting adjustable gas regulator for maximum versatility
A mid-length gas system provides smoother recoil impulse and improved reliability for a balanced shooting experience
The upper receiver is a PWS proprietary piston upper, made from 7075-T6 forged aluminum and anodized for durability
The PWS M-LOK 15.05 Inches handguard (1.7 Inches width, 2.25 Inches height) offers a slim, ergonomic profile with robust accessory mounting options
Radian Raptor ambidextrous charging handle delivers smooth, ergonomic operation for both left and right-handed users
The PWS ambidextrous MK1 MOD 2-M lower receiver is crafted from 7075-T6 forged aluminum, offering durability and full AR-15 compatibility
This model features a Mil-Spec enhanced trigger with a PTFE-coated surface for smooth performance
Includes a PWS enhanced buffer tube with a ratchet lock castle nut, end plate set and built-in QD mount for added stability and attachment options
PWS enhanced H2 steel body buffer reduces recoil and enhances reliability for smoother cycling
Outfitted with a Bravo Company USA buttstock and pistol grip for improved ergonomics and control

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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.

Magazines will be removed from firearms when shipping to states with magazine capacity restrictions.

California 10+ Round Magazine Buyers: PSA values your freedom and constitutional rights above all else. However, PSA will not accept new orders nor will ship any order until the Ninth Circuit Federal Court of Appeals mandate becomes finalized. Once this mandate is finalized, we will start accepting new orders and ship 10+ round magazines to California Customers.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).