The PWS MK1 MOD 2-M is a complete, ambidextrous AR-15 lower receiver built by Primary Weapons Systems for shooters who want a forged, mil-spec foundation ready to mount to a compatible upper (brand part no. MK1M2LWRCR). Primary Weapons Systems got its start building muzzle devices before developing its long-stroke piston system, and that same attention to reliability under hard use carries into this MK1 MOD 2-M lower. Machined from T6 7075 forged aluminum and finished in hard-coat black anodize, it ships complete with an enhanced mil-spec trigger, PWS enhanced buffer tube, and fully ambidextrous controls so left- and right-handed shooters get the same fast, natural manipulation. It is built around the standard AR-15 platform, making it a solid foundation for a 5.56 NATO/.223 Remington build or another AR-15-pattern caliber.

Key Specifications

• Caliber Compatibility: 5.56 NATO/.223 Remington AR-15 platform, built to accept standard AR-15 pattern uppers.
• Configuration: a complete lower receiver that ships fully assembled and ready to mate with a compatible upper.
• Material: T6 7075 forged aluminum for maximum strength versus a cast or billet receiver.
• Finish: hard-coat black anodized to MIL-A-8625F Type III Class 2 for wear and corrosion resistance.
• Controls: fully ambidextrous, with the magazine release, bolt catch, and safety selector operating from either side.
• Trigger: a mil-spec enhanced trigger with a 5.5 to 6.5 lb pull for a crisper feel than a standard mil-spec trigger.
• Buffer Tube: a PWS enhanced buffer tube built to PWS’s own spec for reliable buffer and spring function.
• Weight: 2.3 lbs complete, a lightweight foundation for a custom AR-15 build.
• Action: semi-automatic, fully compatible with standard AR-15 fire control components.

Frequently Asked Questions

Does this lower come complete or stripped? It ships as a complete lower receiver with the trigger, safety, magazine release, and buffer tube already installed.

Is it ambidextrous? Yes, the magazine release, bolt catch, and safety selector all operate from either side of the receiver.

What uppers is it compatible with? It is built to standard AR-15 mil-spec dimensions and compatible with 5.56 NATO/.223 Remington and other AR-15-pattern uppers.

Buy the PWS MK1 MOD 2-M Complete AR-15 Lower Receiver

A forged, ambidextrous lower like this one is the kind of foundation serious AR-15 builders start with before adding their own upper and optics. Explore more of PWS’s AR-15 lowers and order yours from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.