Sons of Liberty Gun Works L89 AR-15 8.5 inch .300BLK Upper Receiver Group Medium Midlength 1-7 Plan B Black
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Sons of Liberty Gun Works
Overview
The Sons of Liberty Gun Works L89 AR-15 Upper Receiver Group features a complete assembly with an 8.5-inch barrel chambered in .300 Blackout, making it ideal for compact builds that require versatility in both suppressed and unsuppressed configurations. The mid-length gas system enhances reliability and reduces recoil, while the 1:7 twist rate stabilizes a wide range of bullet weights, ensuring optimal performance. This upper is commonly found in short-barreled rifle setups, particularly those designed for close-quarters use or as truck guns.
Specifications
Sons of Liberty Gun Works L89 AR-15 8.5 inch .300BLK Upper Receiver Group Medium Midlength 1-7 Plan B Black
Available Merchants(4)
Prices checked
Stock Alert
September 2026 on GunPartPicker
Sons of Liberty Gun Works L89 AR-15 8.5 inch .300BLK Upper Receiver Group Medium Midlength 1-7 Plan B Black 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 March 2026. All time, it ranks #644 of the 1,683 upper receivers builders have added.
It was hard to find in September 2026, in stock on only 12 of the 25 days we checked, and today none of the 4 retailers we track has it in stock right now. Prices barely moved in September 2026, holding around $1,050, so there haven't been real sales lately. Listed prices start at $950 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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