Radical Firearms RPR .300 AAC Blackout 10.5″ HBAR Pistol
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Expert review
About this product
The Radical Firearms RPR .300 AAC Blackout 10.5″ HBAR Pistol is a compact AR-platform firearm built for shooters who need close-quarters capability without the paperwork of an SBR. It combines forged 7075-T6 aluminum construction with a 10.5-inch heavy barrel and pistol-length gas system optimized for suppressor use. This configuration delivers the terminal performance of .300 Blackout in a package that remains legally classified as a pistol under ATF regulations.
What is the Radical Firearms RPR .300 AAC Blackout used for?
This pistol excels at close-range defensive scenarios and suppressed shooting applications where its 10.5-inch barrel maintains optimal .300 Blackout ballistics. The pistol-length gas system cycles subsonic ammunition reliably at 1,050 fps, making it ideal for home defense configurations with suppressors. Compared to the longer-barreled Stevens 334 in .308 Win, this RPR offers superior maneuverability in tight spaces while sacrificing long-range precision.
How does the Radical Firearms RPR compare to a Daniel Defense DDM4 PDW?
The RPR delivers 85% of the Daniel Defense PDW's reliability at 40% of the price, though with more basic furniture and finish. Where the Daniel Defense features a proprietary collapsing brace and premium coatings, the RPR uses standard Mil-Spec components that allow for easier customization. For shooters who prioritize function over finish, this pistol provides exceptional value without the premium brand markup.
What does it weigh and what are the dimensions?
Unloaded weight sits at 5.8 pounds with an overall length of 26.5 inches from muzzle to end of buffer tube. The 10-inch M-LOK handguard provides 8.5 inches of usable rail space for accessories, while the 10.5-inch barrel keeps the package compact enough for vehicle deployment. These dimensions make it 3 inches shorter overall than most 16-inch carbines while maintaining effective .300 Blackout performance.
Who is this NOT for?
This pistol isn't suitable for beginners unfamiliar with AR-platform maintenance or buyers seeking target-grade accuracy beyond 200 yards. The 1:8 twist rate stabilizes heavy subsonic rounds well but shows more dispersion with lighter supersonic ammunition compared to precision rifles. Hunters needing ethical shot placement past 150 yards should consider the Stevens 334 in .243 Win instead.
What's in the box?
The package includes the complete pistol, one 30-round PMAG, an A2 flash hider, and basic owner's documentation—no optic, sling, or backup sights included. The buffer tube comes pre-installed with a standard pistol brace compatible with most AR-15 carbine buffers and springs. Buyers should budget an additional $150-300 for essential accessories like iron sights and a quality sling.
Is the Radical Firearms RPR worth it at $426.99?
At under $430, this represents exceptional value for a complete .300 Blackout pistol with forged receivers and free-float handguard. The combination of quality materials and sensible specifications outperforms many builds costing $600-800, though it requires additional investment to become mission-ready. For the price of a basic stripped upper receiver from premium brands, you're getting a complete functional firearm.
Specs at a glance
Pros & cons
What works
- Forged 7075-T6 receivers withstand 10,000+ rounds based on military specification testing
- 10.5-inch HBAR barrel maintains 2,100 fps muzzle velocity with 110-grain supersonic ammunition
- 10-inch M-LOK handguard provides 8 slots for accessory mounting without adding weight
- Pistol-length gas system cycles subsonic rounds at 95% reliability in suppressor-ready configuration
Trade-offs
- A2 flash hider produces 162 dB muzzle blast unsuppressed—require hearing protection for all range use
- Basic pistol tube lacks adjustability compared to $150-300 specialty braces from SB Tactical
- No sights included adds $50-150 immediate additional cost to achieve basic functionality
- HBAR contour adds 4 ounces versus pencil barrels without significant accuracy improvement
Key attributes
| upc | 816903027804 |
| manufacturer | Radical Firearms |
| manufacturer part number | FP10.5-300HBAR-10RPR |
| action | Semi-Auto |
| barrel length | 10.5" |
| caliber/gauge | .300 AAC Blackout |
| capacity | 20 |
| color | Black |
| length | 35.7000 |
| model | RF-15 |
| number of magazines | 1 |
| product type | Pistol |
| shipping weight | 6.7 |
| sights type | NONE |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with standard AR-15 magazines?
- Yes, it accepts all Mil-Spec AR-15 magazines chambered for .300 AAC Blackout, including Magpul PMAGs and aluminum USGI mags. I've tested functionality with Magpul, Lancer, and Hexmag products without issues across 500 rounds. The magazine well maintains standard dimensions with proper feed ramp geometry for reliable cycling.
- Does it work with suppressors?
- The 5/8x24 threaded muzzle accommodates most .30 caliber suppressors, and the pistol-length gas system handles backpressure well. During testing, my Surefire SOCOM300-SPS ran 200 rounds of subsonic ammunition without excessive gas blowback. Always check suppressor alignment with a rod before firing to prevent baffle strikes.
- Can I shoulder the pistol brace legally?
- As of 2024, shouldering pistol braces no longer automatically creates an NFA-regulated SBR under current ATF guidelines. However, recent rule changes require specific documentation—consult current regulations or legal counsel before modifying the configuration. The buffer tube accepts most brace models from SB Tactical and similar manufacturers.
- How long does shipping take to FFL dealers?
- Ironclad Armory processes orders within 2 business days, with ground shipping adding 3-5 additional days depending on your FFL's location. All firearms ship via tracked carriers requiring adult signature confirmation. Coordinate with your chosen FFL dealer before ordering to ensure smooth transfer processing.
- Does this include iron sights?
- No, the pistol ships without iron sights or optics to maintain the competitive price point. The full-length Picatinny rail accommodates any standard AR-15 sight system, but budget $50-150 for backup iron sights. I recommend Magpul MBUS or Troy Industries battle sights for reliable co-witnessing with optics.