Sons of Liberty Gun Works M4-89 300BLK Barreled AR-15 Upper Receiver - 16"
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Sons of Liberty Gun Works
Overview
The Sons of Liberty Gun Works M4-89 is a complete AR-15 upper receiver designed specifically for the 300 Blackout caliber, featuring a 16-inch barrel with a 1:7 twist rate. The QPQ Nitride barrel coating enhances durability and resistance to wear, while the carbine-length gas system ensures reliable cycling with various ammunition types. This upper is commonly found in builds that prioritize compactness and versatility, making it an ideal choice for those looking to optimize their 300 Blackout setups.
Specifications
Sons of Liberty Gun Works M4-89 300BLK Barreled AR-15 Upper Receiver - 16"
Available Merchants(1)
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Build history on GunPartPicker
Builders on GunPartPicker first added the Sons of Liberty Gun Works M4-89 300BLK Barreled AR-15 Upper Receiver - 16" to a build in February 2026.
Today the one retailer we track is out of stock. Listed prices start at $855 at BattleHawk Armory for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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