Rock River Arms LAR-BT3 Operator DMR — .308 Win, 20+1, 20" Barrel, Black, Billet Receivers, BCM® SOPMOD Stock, 17" M-LOK® Handguard, Hogue® Beavertail Grip, Magpul® MBUS® Pro Sights, OEM Match Trigger (Model OP1005BT | UPC 842834115464)

Built to stretch the legs of .308 Winchester, the Rock River Arms LAR-BT3 Operator DMR is a precision-focused AR-10–pattern rifle that blends billet construction, premium furniture, and competition-grade controls. Anchored by a 20" barrel, a rigid billet upper/lower receiver set, and a long 17" free-float M-LOK® handguard, the BT3 Operator DMR delivers the stability and consistency long-range shooters, hunters, and patrol marksmen demand. Out of the box you get a BCM® SOPMOD stock for rock-solid cheek weld, a Hogue® Beavertail grip for confident control, low-profile Magpul® MBUS® Pro steel sights, and an OEM match trigger tuned for a crisp, predictable break—everything you need to ring steel or post tight groups at distance.

Why the LAR-BT3 Operator DMR Stands Out

• Long-Range .308 Precision: The 20" barrel optimizes velocity and dwell for dependable accuracy with popular 155–175gr match loads.

• Billet Receiver Rigidity: Machined billet upper and lower enhance fitment and help maintain repeatable barrel/rail alignment for consistent zero.

• 17" Free-Float M-LOK® Handguard: Maximum sight radius and abundant rail space for bipods, bags, lasers, tripods, and sling QDs without influencing barrel harmonics.

• BCM® SOPMOD Stock: Wide, stable cheek weld and storage compartments; locks up tight to reduce wobble during positional shooting.

• Hogue® Beavertail Grip: Comfortable palm swell with traction in wet or gloved conditions for better trigger control and recoil management.

• Magpul® MBUS® Pro Sights: Durable, low-profile steel backups ready the rifle for immediate range use—even before glass goes on.

• OEM Match Trigger: Clean wall, crisp break, and short reset that promote smaller groups and more consistent shot cadence.

Purpose-Built for Distance

• DMR Ergonomics: The extended handguard supports modern prone, barricade, and tripod techniques while keeping the support hand forward for better recoil tracking.

• Consistency Shot-to-Shot: Free-float system and billet rigidity help reduce POI shift as the barrel heats, keeping groups tight during strings.

• Ready for Optics: Flat-top receiver pairs perfectly with LPVOs, mid-power scopes (2-10x/3-15x), or high-power glass—plus offset red dots if desired.

Real-World Use Cases

• Precision Range & Competition: A natural fit for PRS-style gas gun matches, steel challenges, and club DMR courses.

• Hunting (where lawful): .308 Win authority for medium/large game with the reach and repeatability to make ethical shots.

• Ranch & Patrol Roles: Accurate, dependable performance for property defense or designated marksman tasks (follow all regulations and agency policies).

Setup Tips (Get the Most From Your BT3 DMR)

1. Optics: Pair with a quality 2-10x, 3-15x, or 4-16x optic on a solid one-piece mount; confirm torque values.

2. Zero: Many shooters prefer a 100-yard zero for precision dope; verify cold-bore impact and log environmental conditions.

3. Support Gear: Add an M-LOK® Arca rail for tripod work, a bipod (Harris/Atlas) at 6 o’clock, and a rear bag for prone stability.

4. Ammo Vetting: Test several match loads (e.g., 168gr and 175gr OTM) and record velocities/SDs for a reliable drop chart.

Specifications

• Manufacturer: Rock River Arms (RRA)

• Model: LAR-BT3 Operator DMR

• Caliber: .308 Winchester (consult the owner’s manual regarding any 7.62×51 NATO compatibility before use)

• Capacity: 20+1 (magazine dependent; observe local laws)

• Barrel Length: 20 inches

• Gas/Operating System: AR-10–pattern, free-float handguard

• Handguard: 17" M-LOK® free-float

• Receivers: Billet upper & lower, black finish

• Stock: BCM® SOPMOD adjustable

• Grip: Hogue® Beavertail

• Sights: Magpul® MBUS® Pro (steel, low profile)

• Trigger: OEM match trigger

• Overall Color: Black

• Model #: OP1005BT

• UPC: 842834115464

What’s in the Box*

• RRA LAR-BT3 Operator DMR .308 Win (20")

• Magpul® MBUS® Pro front & rear sights (installed)

• (1) Magazine (type/capacity may vary by state/dealer)

• Owner’s manual & lock
  *Contents can vary by shipment or dealer package—verify your retailer’s listing.

Care, Maintenance & Best Practices

• Break-In & Clean: Follow RRA’s barrel break-in guidelines; keep the BCG lightly lubricated for smooth cycling.

• Fastener Checks: Re-torque scope mounts and M-LOK® hardware after the first live-fire session.

• Data Book: Track round count, group sizes, and environmental notes to refine dope for your preferred loads.

Safety & Compliance

• Know Your Laws: Compliance for magazine capacity, features, and hunting regulations varies by jurisdiction—confirm before purchase and use.

• Safe Handling: Always verify the rifle is unloaded before cleaning, transport, or adjustments; use quality eye/ear protection.

SEO-Friendly Keywords (Use Naturally on Your Product Page)

Rock River Arms LAR-BT3 Operator DMR, OP1005BT, .308 Win AR-10 20 inch, billet receiver 308 rifle, BCM SOPMOD stock 308, 17" M-LOK handguard, Magpul MBUS Pro sights, Hogue beavertail grip, match trigger AR-10, UPC 842834115464.

Reach farther with confidence. The RRA LAR-BT3 Operator DMR pairs a 20" .308 Win barrel, billet receivers, premium furniture, and a match trigger to deliver the accuracy, consistency, and control that long-range shooters demand.

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