The Radical Firearms RF-15 RPR .300 Blackout 10.5-inch pistol is a heavy-barrel AR pistol built on forged MIL-STD receivers (brand part no. FP105300HBAR10RPR). Radical Firearms pairs the HBAR barrel with a pistol-length gas system and a 10-inch RPR free-float rail, so the gun cycles reliably with supersonic and subsonic loads. The slim M-LOK rail leaves room for a light, a grip or a sling mount. It suits a shooter building a suppressor-ready .300 Blackout pistol.

Key Specifications

• The chambering is .300 AAC Blackout, a short-case cartridge suited to compact barrels.
• The barrel is 10.5 inches in a heavy HBAR profile, which adds rigidity and durability.
• The barrel steel is 4140 chrome moly vanadium, made for long-term use.
• The barrel finish is Melanite, a corrosion-resistant treatment.
• The twist rate is 1:8, which stabilizes common .300 Blackout projectile weights.
• The handguard is a 10-inch RPR free-float rail with a thin M-LOK interface for lights, grips and other accessories.
• The gas system is pistol length, tuned for reliable cycling with the .300 Blackout cartridge.
• The gas block is a low-profile .750 design that fits beneath the free-float rail.
• The receivers are forged 7075-T6 aluminum, upper and lower, in a MIL-STD pattern.

Frequently Asked Questions

Is it suppressor ready? Radical lists suppressor-ready pistol platforms among the intended uses for this configuration, and the heavy 10.5-inch barrel and pistol-length gas system suit it.

What is the twist rate? The HBAR barrel is rifled 1:8, which stabilizes common .300 Blackout bullet weights.

What handguard does it have? A 10-inch RPR free-float rail with a thin M-LOK interface.

Buy the Radical Firearms RF-15 RPR AR Pistol, .300 Blackout, 10.5-Inch, 10-Inch Rail

This RPR build keeps the .300 Blackout formula simple: a heavy 10.5-inch barrel, a long free-float rail and forged receivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more AR pistols while you are here.