M4-L89 5.56x45 NATO Assembled Upper Receiver - M4-L89 5.56x45 NATO 14.5"BBL 13.75" L89 Rail W/NOX9
All Sons of Liberty Gun Works upper receivers
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Sons of Liberty Gun Works
Overview
The M4-L89 5.56x45 NATO Assembled Upper Receiver from Sons of Liberty Gun Works is a complete upper assembly designed specifically for the AR-15 platform, featuring a 14.5-inch barrel optimized for 5.56 NATO ammunition. This configuration offers a balance of maneuverability and ballistic performance, making it suitable for a variety of applications, whether in tactical scenarios or recreational shooting. This upper receiver is commonly found in builds focused on compactness and versatility, ideal for both home defense and competitive shooting.
Specifications
M4-L89 5.56x45 NATO Assembled Upper Receiver - M4-L89 5.56x45 NATO 14.5"BBL 13.75" L89 Rail W/NOX9
Build history on GunPartPicker
Builders on GunPartPicker first added the Sons of Liberty Gun Works M4-L89 5.56x45 NATO Assembled Upper Receiver - M4-L89 5.56x45 NATO 14.5"BBL 13.75" L89 Rail W/NOX9 to a build in July 2026.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $837.19 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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