FMK Firearms AR-1 AR15 Polymer Lower Receiver Blue

The FMK Firearms AR-1 polymer lower receiver is a stripped lower intended for AR-15 platform projects. Manufactured in the USA from a high-impact proprietary composite polymer, it is designed to provide strength, durability, and reduced weight for builders. The receiver is finished in matte blue and is offered as a stripped lower with a lifetime warranty.

Key Specifications

• The caliber/gauge is listed as .223 REM/5.56 NATO.
• This item is a Stripped Lower Receiver for AR-15 builds.
• The model designation is AR-1.
• The finish is specified as Matte Blued.
• The exterior color is Blue.
• The manufacturer states the material is a high-impact proprietary composite polymer.
• The product is manufactured in the USA.
• The manufacturer provides a lifetime warranty for this lower receiver.
• The action designation on file is Semi-Auto.

This FMK AR-1 polymer lower serves as a lightweight, durable foundation for AR-15 builds where reducing weight without sacrificing structural integrity is a priority. Its polymer construction and matte blue finish offer a distinct profile for custom projects, while the lifetime warranty reflects the manufacturer's coverage for the receiver. Well-suited for builders who value durable components and straightforward, no-nonsense specification, the AR-1 provides a reliable starting point for a range of AR-15 configurations.