Description
The Rock River Arms LAR-15 Varmint EOP AR-15 A4 24″ Heavy Barrel, 1/12 Twist, M-Lok Rail20 Rd Mag is a precision-oriented AR-15 rifle built for consistent, long-range accuracy. It features a 24-inch heavy barrel with a 1:12 twist rate optimized for lighter varmint cartridges, mounted on a forged A4 upper with a free-float M-Lok handguard for stable, repeatable shots. This rifle is a purpose-built tool for the shooter who demands sub-MOA performance on small targets at extended distances.
Key Features
- 24-Inch Heavy Barrel: Provides maximum velocity and a rigid platform for enhanced accuracy, minimizing barrel whip.
- 1:12 Twist Rate: Specifically engineered to stabilize lighter .223 Remington/5.56 NATO varmint bullets (40-55 grain) for optimal terminal performance.
- Free-Float M-Lok Handguard: Eliminates point-of-impact shift from sling pressure or bipod use and allows for direct accessory attachment.
- Forged A4 Upper Receiver: Offers proven durability and a solid foundation for the barrel assembly.
- Two-Stage Match Trigger: Delivers a clean, predictable break essential for precision shooting.
Specifications & Details
| Caliber | .223 Remington / 5.56 NATO |
|---|---|
| Barrel Length | 24 Inches |
| Twist Rate | 1:12 |
| Handguard | 15-inch M-Lok Free-Float |
| Trigger | RRA Two-Stage Match |
| Magazine | Includes one 20-round Magpul PMAG |
The rifle’s overall length stretches to approximately 44 inches, and with that heavy barrel profile, you’re looking at a weight around 9.5 pounds unloaded. This isn’t a rifle you’ll be clearing rooms with—it’s a dedicated platform for the bench or the prone position. The system is mil-spec compatible, meaning it works with standard AR-15 lowers and a vast array of aftermarket parts, so customization is straightforward. Here’s the thing—when it comes to connecting on a prairie dog at 300 yards, the heavy barrel’s consistency and the 1:12 twist’s stabilization of a 50-grain V-Max are what make the difference between a hit and a miss.
Who This Rifle Is For
This LAR-15 Varmint model is for the shooter who has a specific problem: small, destructive pests at range. It’s for the farmer protecting crops, the land manager controlling ground squirrel populations, or the precision enthusiast who enjoys the challenge of tiny groups on paper. It’s built for scenarios where the first shot placement is critical and follow-up shots need to land in the same hole. If your mission involves a bipod, a scope, and calculated wind calls, this is your rifle.
Pros & Cons
Pros: The 24-inch barrel squeezes out every bit of velocity from .223 rounds, making trajectories flatter and hits more certain. The two-stage trigger is drop-in ready for serious work, requiring no gunsmithing to achieve a professional-grade pull. The free-float rail ensures your optics and accessories stay true, shot after shot.
Cons: That 24-inch heavy barrel makes the rifle long and weighty—it’s not a patrol or CQB weapon. The 1:12 twist is a specialist; it excels with light varmint bullets but may not properly stabilize heavier 70+ grain projectiles favored for some long-range target or tactical work.
Frequently Asked Questions
Q: Can this rifle fire standard 5.56 NATO ammunition?
A: Yes. The chamber is rated for both .223 Remington and 5.56 NATO, but remember the 1:12 twist is optimized for lighter bullets commonly found in varmint-specific loads. It will cycle standard M193 55-grain ball ammo effectively.
Q: Is the upper assembled and ready to mount on my lower?
A: Yes, this is a complete rifle. The Rock River Arms LAR-15 Varmint EOP arrives as a fully assembled firearm, ready for optics mounting and zeroing. An FFL transfer is required for firearm purchases, and it ships to Missouri and compliant US states.
Q: What optic would you recommend for this setup?
A: A variable-power scope in the 4-16x or 6-24x range from brands like Vortex, Leupold, or Nikon is ideal. You need magnification to see small targets at distance and precise reticles for holdovers. Pair it with a quality 20 MOA cantilever mount for maximum elevation adjustment.
Priced at $1238.44, this Rock River Arms build offers serious out-of-the-box precision without the custom shop price tag. It’s a focused tool that delivers where it counts. See the full details and availability at firearms-missouri.com for Missouri residents and nationwide.
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