Ambidextrous lower receivers have shifted the tactical landscape for AR-15 builders and operators who demand true bilateral control and rock-solid ergonomics. Whether assembling a patrol rifle, a home defense build, or a competition setup, a stripped lower that eliminates rattles and supports multiple calibers is a high-value component for any serious toolkit.

PRIMARY WEAPONS SYSTEMS (PWS) MK1 MOD 2-M LOWER RECEIVER is a stripped lower receiver for AR-15 style rifles that brings factory-grade ambidexterity and fitment to your build. The MK1 Mod 2-M features fully ambidextrous controls and a receiver tension screw designed to remove any rattle between the upper and lower, while remaining multi-caliber rated and compatible with most mil-spec upper receivers and standard AR-15 magazines.

Design and Ambidextrous Controls

The MK1 Mod 2-M is engineered around practical control placement. Fully ambidextrous selector and magazine release interfaces allow operators to transition shoulders or support-hand reloads without sacrificing speed or ergonomics. The integrated receiver tension screw is a subtle but critical feature: tightening it removes play between upper and lower, improving perceived accuracy and eliminating noise that can give position away during quiet operations.

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Fit, Compatibility, and Multi-Caliber Use

As a Lower Receivers category item, this stripped lower is built to mil-spec dimensions and is compatible with most mil-spec upper receivers and standard AR-15 magazines. The multi-caliber rating gives builders flexibility to configure for common AR chamberings, making it a pragmatic choice for modular systems and caliber conversion projects. At a price of $260.09, it sits competitively for a precision-machined, ambidextrous lower.

Why the Brand Matters

Primary Weapons Systems (Pws) has a reputation for innovative component design; the MK1 Mod 2-M continues that trend by addressing practical shootability and durability concerns that matter in both duty and sport contexts.

Practical Notes for Builders

Installers should verify headspace and torque pins to mil-spec during assembly. The tension screw lets you dial in a snug fit with your matched upper to reduce movement without impeding disassembly. For operators looking for a versatile, ambidextrous platform, this lower is a robust starting point.

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