Primary Weapons MK1-M2-LWR MK1 Mod 2-M Black Anodized Stripped Lower For AR-15, Oversized Ambidextrous Bolt Release/Catch

The Primary Weapons Systems MK1 Mod 2-M stripped lower receiver gives you a clean canvas to build an AR-15 that fits how you actually shoot. Built from 7075-T651 forged aluminum and finished in Mil-Spec Type III Class 2 hard coat anodize, this lower is engineered to handle the demands of the range, the field, or the competition course. What sets it apart is the oversized ambidextrous bolt release and catch—controls that work intuitively for both left and right-handed shooters without forcing you to compromise on ergonomics or reach.

This is a stripped lower, so you're starting with the serialized foundation and building from there. The 7075-T6 aluminum alloy is forged—not cast—which means better integrity and consistent material properties throughout. The hard coat anodize protects against wear and corrosion without adding bulk. At 7.6 oz stripped, it won't weigh down your build while you're figuring out the upper and furniture that match your mission.

Whether you're assembling your first AR or your fifth, a quality lower is non-negotiable. The MK1 Mod 2-M keeps things straightforward: no gimmicks, no over-engineering, just a solid foundation that respects ambidextrous shooters and leaves room for your personal touches up the chain.

Key Features

• Oversized ambidextrous bolt release and catch for intuitive operation by left and right-handed shooters
• 7075-T651 forged aluminum construction for durability and structural integrity
• Mil-Spec Type III Class 2 hard coat anodize finish resists corrosion and wear
• Stripped configuration—serialized lower with no internal parts, ready for custom assembly
• Lightweight at 7.6 oz with no parts installed

Specifications

Frequently Asked Questions

Is this lower compatible with AR-15 uppers?

Yes, this is an AR-15 platform stripped lower and will accept standard AR-15 upper receivers.

What does "stripped" mean?

Stripped means you receive the lower receiver itself—the serialized, regulated part—without any internal fire control group components. You'll need to source and install the trigger group, hammer, safety selector, magazine catch, and grip separately to complete your rifle.

Will this work for both left and right-handed shooters?

The oversized ambidextrous bolt release and catch make it accessible for both left and right-handed operation. The ambidextrous controls are built into this lower.

What finish is this lower in?

This lower comes in black anodize, finished to Mil-Spec Type III Class 2 hard coat standards for durability and corrosion resistance.