The Radical Firearms RPR is a semi-automatic AR-15 pistol chambered in 5.56x45mm NATO with a 10.5-inch black Melonite threaded barrel. It ships with a 30-round magazine and uses MFT furniture including a stabilizing brace. The handguard is a free-float M-LOK rail system with a Picatinny top rail on the upper receiver. 
 

Key Specifications 

• Brand: Radical Firearms 
• Model: RPR 
• Caliber: 5.56x45mm NATO 
• Action: Semi Auto 
• Capacity: 30+1 
• Barrel Length: 10.5 in 
• Color/Finish: Black Melonite 
   

Detailed Features 

• 10.5-inch Melonite-finished threaded barrel 
• Free-float M-LOK handguard 
• Picatinny rail on upper receiver 
• MFT stabilizing brace and grip 
• 30-round magazine included

Owners of the Radical Firearms RPR in 10.5-inch configuration tend to praise the price-to-build quality ratio. The Melonite barrel finish gets positive mentions for corrosion resistance, and the free-float M-LOK rail gives a clean platform for accessories without extra cost.

The MFT brace and furniture arrangement gets reasonable marks. It is functional out of the box, though experienced AR shooters often swap the grip and brace early. The threaded barrel is a popular feature for those who plan to add a muzzle device.

At 5.56x45mm NATO from 10.5 inches, the concussion and blast are the most consistent complaints at indoor ranges. Reliability reports on the RPR are generally positive, with the occasional note that a break-in period helps the bolt carrier group seat properly.