Rock River Arms BLK2142 LAR-15M RRAGE 300 AAC Blackout 30+1 10.50″ Black Threaded Barrel, M-LOK Handguard, Black Aluminum Picatinny Rail Receiver, Black Polymer SB Tactical SBA3 Brace, Black A2 Grip
About this product
The Rock River Arms BLK2142 LAR-15M RRAGE 300 AAC Blackout pistol features a 10.50-inch threaded barrel, SB Tactical SBA3 brace, M-LOK handguard, and 30+1 capacity. Built for suppressed shooting and home defense at $1155.48.
Available for delivery across the United States.
The Rock River Arms BLK2142 LAR-15M RRAGE in 300 AAC Blackout is a purpose-built tactical pistol that delivers subsonic and supersonic performance from a compact 10.50-inch platform. Chambered in 300 AAC Blackout with a 30+1 magazine capacity, this rifle features a black threaded barrel for suppressor attachment, a low-profile gas block, a 7.25-inch M-LOK free-float handguard, and a SB Tactical SBA3 pistol brace. The black aluminum Picatinny receiver and A2 grip complete the package. At $1155.48, this Rock River Arms BLK2142 LAR-15M RRAGE 300 AAC Blackout 30+1 10.50-inch black threaded barrel, M-LOK handguard, black aluminum Picatinny rail receiver, black polymer SB Tactical SBA3 brace, black A2 grip is ready for duty.
| Manufacturer | Rock River Arms |
|---|---|
| Model | BLK2142 LAR-15M RRAGE |
| Material | Black Aluminum (receiver), Black Polymer (brace/grip), Steel (barrel) |
| Compatibility | 300 AAC Blackout ammunition, AR-15 lower parts (per manufacturer specs) |
| Finish | Black anodized aluminum, black polymer, black oxide barrel |
| Weight | Approximately 6.2 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 10.50-inch Threaded Barrel: Why it matters – This length optimizes 300 AAC Blackout ballistics for both subsonic and supersonic loads, and the 1:8 twist stabilizes heavy match bullets. The threaded muzzle (5/8×24) accepts suppressors or an A2 flash hider directly.
- SB Tactical SBA3 Adjustable Brace: Why it matters – The SBA3 uses a carbine buffer tube and provides a stable, adjustable cheek weld for rapid target transitions while staying legally compliant as a pistol brace. It collapses and extends without tools.
- 7.25-inch M-LOK Free-Float Handguard: Why it matters – Free-floating eliminates barrel contact, preserving accuracy potential. M-LOK slots allow direct attachment of rails, bipods, and lights without adding weight or bulk.
- Low-Profile Gas Block: Why it matters – Keeps the handguard diameter slim and allows for suppressor clearance. The block is pinned to the barrel for positive gas seal and reliability under rapid fire.
- Single-Stage Trigger: Why it matters – A clean, consistent break at approximately 5.5 lbs aids speed without sacrificing precision. The single-stage design is predictable for defensive or competition use.
Who It’s For
This build targets shooters who want a compact 300 BLK pistol for home defense, truck gun, or suppressed plinking. If you run subsonic loads with a suppressor and need a reliable, accurate platform under 30 inches overall, the RRAGE fits. It also suits shooters who prefer a pistol brace over an SBR tax stamp, and want M-LOK compatibility for accessories.
Pros & Cons
- Pros: Factory-built reliability; 30+1 magazine capacity; SB Tactical brace included; threaded barrel accepts standard suppressors; M-LOK handguard for modularity.
- Cons: The single-stage trigger is not upgradeable without replacing the entire fire control group. Some shooters prefer a two-stage for precision work. Also, the 10.5-inch barrel produces more muzzle blast with supersonic loads compared to longer barrels.
Comparison vs. Competitors
| Feature | Rock River Arms BLK2142 | Zev Technologies OZ9C | Geissele Super Duty 10.3″ |
|---|---|---|---|
| Caliber | 300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 10.50″ | 4.5″ | 10.3″ |
| Brace/Stock | SB Tactical SBA3 | None (pistol frame) | B5 Systems (stock) |
| Handguard | 7.25″ M-LOK | Integrated | 12″ M-LOK |
| Trigger | Single-stage | Flat-face | Geissele SSA-E two-stage |
| MSRP | $1,155 | $1,699 | $1,899 |
| Best For | Suppressed 300 BLK, home defense | Concealed carry, competition | Duty rifle, precision |
FAQ
What is the twist rate on the barrel?
Per Rock River Arms specs, the barrel has a 1:8 twist, optimized for 300 AAC Blackout bullets from 110 to 220 grains.
Can I mount a suppressor directly?
Yes. The barrel is threaded 5/8×24. You can attach a direct-thread suppressor or use a muzzle device with compatible threading.
Is this considered a pistol or a rifle?
It ships as a pistol with an SB Tactical SBA3 brace, not a stock. Check your state laws before adding a vertical foregrip.
Does it come with a magazine?
Yes. One 30-round magazine is included, along with a manual and warranty info.
Last updated: April 2026. According to NSSF data, 300 AAC Blackout accounts for over 12% of AR-style pistol sales in the US, making this caliber a solid choice for compact builds.
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