Radical Firearms RADICAL UPPER 300BLK 10.5″ M-LOK

The Radical Firearms 10.5″ complete upper is built for reliable performance in .300 AAC Blackout configurations. This upper pairs a CMV steel HBAR-contour barrel with a 1:8 twist and a durable nitride finish. A 10″ RPR free-float M-LOK rail provides accessory mounting while the A2 flash hider handles standard muzzle duties. Designed for use on MIL-STD lowers, it suits range use and compact AR builds.

Key Specifications

• The caliber is .300 AAC Blackout.
• The barrel measures 10.5 inches.
• The twist rate is 1:8.
• The barrel material is CMV steel.
• The external finish is Nitride.
• The handguard is a 10-inch RPR free-float M-LOK system.
• The barrel contour is HBAR.
• The muzzle device is an A2 flash hider.
• The color is Black.
• The product type is a Complete upper receiver.

This upper is a practical choice for shooters building compact AR platforms who want a factory-configured component that ships ready to mate with MIL-STD lowers. With a proven twist rate, robust barrel material and a versatile M-LOK rail, it balances durability and modularity for deliberate range work and general-purpose use.