Sons of Liberty Gun Works M4-L89 5.56 NATO Barreled Upper Receiver - 12.5"
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Sons of Liberty Gun Works
Overview
The Sons of Liberty Gun Works M4-L89 is a complete barreled upper receiver designed for the AR-15 platform, featuring a 12.5-inch barrel chambered in 5.56 NATO. This configuration offers a balance of maneuverability and performance, making it well-suited for close-quarters engagements while still delivering reliable accuracy at moderate distances. Builders often incorporate this upper in compact, tactical builds where a shorter barrel is advantageous.
Specifications
Sons of Liberty Gun Works M4-L89 5.56 NATO Barreled Upper Receiver - 12.5"
September 2026 on GunPartPicker
Sons of Liberty Gun Works M4-L89 5.56 NATO Barreled Upper Receiver - 12.5" ranked #267 of the 615 upper receivers builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #946 of the 1,683 upper receivers builders have added.
Today none of the 2 retailers we track has it in stock right now. Listed prices start at $855 at Optics Planet for when it comes back.
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