Description
The Rock River Arms LAR-300 X-Series SA 300 AAC 18″ Barrel, Carbine Stock Black, 30rd is a purpose-built AR-platform rifle chambered in the hard-hitting 300 AAC Blackout cartridge. It’s engineered for reliable performance with both supersonic and subsonic ammunition, making it a versatile tool for defense, hunting, and tactical applications where terminal ballistics and sound management are priorities.
Key Features
- 300 AAC Blackout Chambering: Delivers superior energy transfer and terminal performance compared to 5.56mm in shorter barrels, especially with subsonic loads.
- 18″ Chrome-Moly Barrel: Provides optimal velocity for the cartridge while maintaining a maneuverable profile. The 1:8 twist rate stabilizes a wide range of bullet weights.
- Carbine-Length Gas System: Ensures reliable cycling across various ammunition types, from light supersonic rounds to heavy subsonics.
- Two-Stage National Match Trigger: Offers a clean, predictable break for enhanced control and shot placement.
- Mil-Spec Compatibility: Built to standard AR-15 specifications, allowing for extensive customization with aftermarket parts from brands like Magpul, BCM, and Geissele.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | 300 AAC Blackout |
| Barrel Length | 18 inches |
| Twist Rate | 1:8 |
| Stock | 6-Position Carbine Stock |
| Trigger | Two-Stage National Match |
| Magazine Capacity | 30 Rounds |
The rifle features a forged aluminum upper and lower receiver set, a free-float handguard for consistent point of impact, and a durable phosphate finish. At a total length of approximately 35 inches and a weight around 7.5 lbs unloaded, it balances handling and stability. The package is drop-in ready—just add optics, a sling, and ammunition. This model is available at firearms-missouri.com for Missouri residents and nationwide, with an MSRP of $1238.53.
Who This Rifle Is For
This isn’t a range toy. It’s for the shooter who understands cartridge selection as a tactical variable. When it comes to home defense, the 300 BLK’s performance with shorter barrels and suppressed fire is a major advantage. It’s for the hunter pursuing medium game in dense brush where a heavier projectile shines. It’s also for the prepared citizen who values a system that can be easily adapted for multiple roles—from a quiet, hard-hitting patrol rifle to a capable hunting platform—without sacrificing the ergonomics and manual of arms of the AR-15.
Pros & Cons
Pros: The 300 AAC Blackout cartridge is the star here, offering formidable stopping power, especially effective in shorter barrel configurations ideal for vehicle or structure use. The two-stage trigger is a significant upgrade over standard mil-spec units. Rock River’s build quality is consistently solid, and the mil-spec design means you own a platform, not just a rifle. Ammunition, while more expensive than 5.56mm, is widely available.
Cons: That’s the trade-off. Ammunition cost is the primary consideration—practice ammo runs notably higher than .223 Remington. You also give up some long-range flat trajectory compared to 5.56mm. The 18-inch barrel is excellent for velocity but consider if you plan to primarily use a suppressor; a 16-inch or shorter barrel might be more compact. Here’s the thing—you’re paying for specialized capability, so if you don’t need what the 300 BLK offers, a standard 5.56mm rifle may be more economical.
Frequently Asked Questions
Q: Can I use standard 5.56mm/.223 magazines with 300 AAC Blackout?
A: Yes, in most cases. The 300 BLK cartridge is designed to work with standard AR-15 magazines, including common 30-round PMAGs. However, some shooters prefer dedicated magazines marked for 300 BLK to prevent accidental mixing with 5.56mm rounds, which is a critical safety issue.
Q: Is this rifle suppressor-ready?
A: Absolutely. The 300 AAC Blackout round was practically designed for suppressed use. The rifle features a standard 5/8×24 thread pattern on the muzzle, ready for a direct-thread or quick-detach muzzle device and suppressor. Using subsonic ammunition, it becomes a remarkably quiet system.
Q: What’s the effective range for hunting with this setup?
A: With the 18-inch barrel, you can effectively take medium game like whitetail deer out to around 200 yards with proper supersonic hunting ammunition. The cartridge’s strength is energy delivery at short to medium ranges, making it ideal for wooded or brushy environments where shots are typically closer.
Ready to add this versatile 300 Blackout platform to your collection? Configure your order and start the FFL transfer process on our product page.
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