Description
The Rock River Arms .LAR-BT3 Precision Rifle 308/7.62×51 18″ Fluted SS Barrel is a purpose-built, semi-automatic precision platform designed for consistent, repeatable accuracy at extended ranges. It combines a match-grade stainless steel barrel with a robust, free-floated handguard and a two-stage trigger in a reliable AR-10 pattern rifle, offering a ready-to-deploy solution for demanding shooters.
Key Features
- 18″ Fluted Stainless Steel Match Barrel: Enhances cooling, reduces weight, and provides superior accuracy with .308 Winchester/7.62x51mm NATO.
- Two-Stage National Match Trigger: Delivers a crisp, predictable break essential for precision shot placement.
- 15″ Free-Float Aluminum Handguard: Provides a rigid, non-contact platform for optics, bipods, and accessories without affecting barrel harmonics.
- Fully Adjustable A2-Style Stock: Allows for precise length-of-pull customization to fit the shooter.
- Chrome-Lined Bolt Carrier Group: Ensures reliable operation and increased durability under sustained fire.
Specifications & Details
| Caliber | .308 Winchester / 7.62x51mm NATO |
|---|---|
| Barrel | 18″ Fluted Stainless Steel, 1:10″ Twist |
| Overall Length | ~38.5″ (Stock Collapsed) |
| Weight | Approx. 9.5 lbs (Unloaded) |
| Magazine | 20-Round (Accepts SR-25/Magpul PMAG .308 pattern magazines) |
| Trigger | Rock River Arms Two-Stage National Match |
When it comes to making a first-round hit on a distant target, your rifle needs to be a known quantity. The LAR-BT3 is built to be exactly that. Its 18-inch fluted barrel strikes a practical balance between velocity and maneuverability, making it effective from a supported hunting blind or a competition shooting bay. The rifle is mil-spec compatible, meaning it works with a wide range of standard AR-10 pattern components and accessories, giving you room to tailor it to your specific needs. At a weight of approximately 9.5 pounds unloaded, it’s substantial enough to be stable but not so heavy it becomes a burden during a long day afield.
Who This Rifle Is For
This rifle is for the shooter who demands more than minute-of-angle performance from a semi-auto. It’s for the hunter who needs a single, ethical shot at 400 yards on open terrain, the tactical competitor navigating a precision rifle stage, or the prepared individual who understands the value of a reliable, hard-hitting, and accurate defensive tool for rural or ranch security. It’s not a lightweight carbine; it’s a dedicated instrument for controlled, deliberate fire.
Pros & Cons
Pros: The match-grade barrel and trigger provide an immediate accuracy advantage out of the box. The free-float handguard offers unlimited mounting options. Rock River Arms’ reputation for quality construction means this is a rifle built to last. The use of common SR-25 pattern magazines, like Magpul PMAGs, ensures easy sourcing and compatibility.
Cons: The rifle’s weight and length make it less ideal for dynamic, close-quarters use. The premium materials and construction are reflected in its price point of $1428.79. As a complete firearm, an FFL transfer is required for purchase.
Frequently Asked Questions
Q: Is this rifle ready to shoot, or do I need to assemble it?
A: It is a complete, factory-built rifle. It ships ready for you to mount your preferred optic and magazine—no gunsmithing required. Just perform your standard function check, and it’s range-ready.
Q: What type of optic mount does it use?
A: The upper receiver has a flat top Picatinny rail (MIL-STD-1913). This allows you to mount any standard scope rings or a one-piece cantilever mount designed for an AR-platform rifle to achieve proper eye relief.
Q: Can I use standard .308 Winchester ammunition in it?
A: Yes. The Rock River Arms LAR-BT3 is chambered for .308 Winchester and is rated to safely fire both .308 Win commercial ammunition and 7.62x51mm NATO surplus. For best accuracy, we recommend testing various match-grade .308 loads to see what your specific barrel prefers.
Look, precision is about eliminating variables. The LAR-BT3 is engineered to do exactly that, giving you a consistent and trustworthy foundation. This rifle is available at firearms-missouri.com for Missouri residents and nationwide. If your mission requires a .308 that delivers shot after shot with authority and confidence, this platform is built for the task.




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