FMK Firearms AR-1 Blue 5.56 NATO / .223 Rem Stripped Polymer Lower Receiver

The FMK Firearms AR-1 eXtreme is a stripped lower receiver for the AR-15 platform, chambered for .223 Remington and 5.56x45mm NATO. It serves as the foundation of an AR-15 build, housing the fire control components and accepting the upper receiver assembly.

The lower is molded from a high-impact proprietary composite polymer and finished in a matte blued color. It is a semi-automatic action design and is supplied stripped, so no trigger group, buffer, or stock components are included. The manufacturer lists the part number as FMKGAR1ETB.

Because it is a stripped receiver, buyers will need to add their own fire control group, stock, and buffer assembly to complete the build. The part is sized to the AR-15 platform, and the retailer notes the lower is manufactured in the USA.

• Type: Stripped Lower Receiver
• Platform: AR-15
• Calibers: 223 Remington, 5.56x45mm NATO
• Action: Semi-automatic
• Material: Polymer
• Finish: Matte Blued
• Manufacturer Part #: FMKGAR1ETB