Primary Weapons Systems MK1 Mod 2-M Stripped Lower Receiver

The Primary Weapons Systems MK1 Mod 2-M is a stripped ambidextrous lower receiver designed for AR-15 platforms and multi-caliber builds. It is forged from 7075-series aluminum and finished with a MIL-A-8625F Type III Class 2 hard coat black anodize. The receiver ships stripped with a set of proprietary parts to assist in installation and configuration.

Key Specifications

• Manufacturer: Primary Weapons Systems (PWS).
• Model: MK1 Mod 2-M.
• Product type: Stripped lower receiver.
• Material: 7075-T651 (T6) forged aluminum.
• Finish: Hard coat black anodize per MIL-A-8625F Type III Class 2.
• Compatibility: Multi-caliber, AR-15 compatible.
• Controls: Ambidextrous design for left and right-handed operation.
• Included proprietary parts: Left-side magazine release, bolt catch spring, bolt catch screws, tension screw, bolt release lever, and bolt release through pin.
• Style: Stripped.
• Color: Black.

The MK1 Mod 2-M provides a durable, ambidextrous foundation for custom AR builds, combining forged 7075-series construction and mil-spec hard coat anodize to support long-term use and customization. Its included proprietary parts and ambidextrous controls simplify installation and ergonomics for builders focused on a high-quality stripped lower receiver.