Founded in 2008 by dedicated firearm enthusiasts, Primary Weapons Systems began by developing high-performance muzzle devices. Through rigorous testing on various rifles, including M4s and AK-47s, they discovered a striking difference in maintenance requirements after sustained high-round use. This insight led to the creation of the PWS long-stroke piston system, preserving the core functionality of the AR-15 while significantly reducing the need for maintenance in high-volume shooting and adverse conditions. The ambidextrous PWS MK1 MOD 2-M Multi-Caliber Lower is expertly crafted from T6 7075 forged aluminum and features a durable anodized finish. Designed for AR-15 compatibility, this lower offers superior durability, reliability and ergonomic enhancements, making it an exceptional choice for demanding shooters.

Features an ambidextrous magazine release for easy operation from either side
Features an ambidextrous bolt catch for convenient operation from either side
A lightweight design ensures effortless carry and improved agility in the field
The integrated trigger guard enhances durability and provides a seamless, ergonomic design
This model features a Mil-Spec enhanced trigger with a PTFE-coated surface for smooth performance
The trigger pull weight is set between 5.5 and 6.5 lb for consistent 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
Equipped with a PWS enhanced H2 steel body buffer for reduced recoil and reliable performance
Outfitted with Bravo Company USA furniture, including a durable buttstock and ergonomic pistol grip for enhanced handling

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If you live in California, please read this notice before ordering.

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.

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

Must be 21 or older to purchase.

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).

Primary Weapons Systems MK1 Mod 2-M Complete Lower 5.56x45mm, Black