Radical Firearms 10.5" 300 Blackout 1:8 Pistol Length Barreled Upper - 10" RPR Handguard

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Radical Firearms 10.5" 300 Blackout 1:8 Pistol Length Barreled Upper - 10" RPR Handguard - Upper Receiver for AR-15 - view 1
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Radical Firearms

Overview

The Radical Firearms 10.5" 300 Blackout Pistol Length Barreled Upper is a complete upper assembly designed specifically for the AR-15 platform. With a 10.5-inch barrel and a 1:8 twist rate, it provides optimal stabilization for a wide range of bullet weights, making it ideal for both subsonic and supersonic loads. The pistol-length gas system enhances reliability and cycle speed, which is particularly beneficial for tactical and close-quarters applications. This upper is commonly found in builds that focus on the 300 Blackout caliber with a pistol gas system.

Specifications

MPNFU10.5-300HBAR-10RPR
Twist Rate1:8
Barrel Length10.5
Caliber300 Blackout
AssemblyComplete
Gas System LengthPistol
ColorBlack
Material7075-T6 Aluminum
PlatformAR-15

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$377

Build history on GunPartPicker

Builders have been adding the Radical Firearms 10.5" 300 Blackout 1:8 Pistol Length Barreled Upper - 10" RPR Handguard to their builds on GunPartPicker since March 2026. All time, it ranks #659 of the 1,714 upper receivers builders have added.

Today the one retailer we track is out of stock. Listed prices start at $377.01 at BattleHawk Armory for when it comes back.

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