Rock River Arms LAR-BT3 Varmint 308 Win 20+1 20" Stainless Bull Barrel, Black Billet Rec, 17" M-LOK Handgaurd, OEM NSP-2 Carbine Stock, Hogue Overmolded Grip XBT31521

Rock River Arms LAR-BT3 Varmint — .308 Win, 20+1, 20" Stainless Bull Barrel, Black Billet Receivers, 17" M-LOK® Handguard, OEM NSP-2 Carbine Stock, Hogue® OverMolded Grip (Model XBT31521 | UPC 842834119752) Engineered to print tiny groups on warm barrels and windy days, the Rock River Arms LAR-BT3 Varmint takes the proven .308 Winchester platform and optimizes it for stability, heat control, and repeatable accuracy. A 20-inch stainless bull barrel anchors the build, while billet-machined upper and lower receivers add rigidity that helps keep your zero locked, string after string. The long 17" free-float M-LOK® handguard gives you room for bipods, bags, and accessories without touching the barrel, and the rifle’s ergonomics are finished with an OEM NSP-2 carbine stock and a palm-filling Hogue® OverMolded beavertail grip for comfort and control. Why the LAR-BT3 Varmint Dominates the Bench and the Back Forty 20" Stainless Bull Barrel: Heavy contour resists heat-induced POI shift, promoting tight, repeatable groups during extended shot strings. Stainless steel cleans easily and shrugs off the elements. Billet Receiver Precision: Billet upper/lower receivers enhance fit and alignment, supporting consistent harmonics between the barrel and handguard for long-term accuracy. 17" Free-Float M-LOK® Handguard: Plenty of real estate for bipods, Arca/M-LOK adapters, QD sling cups, and barricade stops—all while staying off the barrel to protect accuracy. Ranch-Ready Ergonomics: The NSP-2 carbine stock offers a stable, familiar cheek weld, and the Hogue® OverMolded grip delivers a cushioned, no-slip hold in hot, cold, or wet conditions. .308 Winchester Authority: Broad bullet selection (125–180gr+) for dialing the ideal varmint or medium-game load—and match ammo for ringing steel at distance. Real-World Accuracy Advantages Thermal Stability: The bull barrel’s mass mitigates rapid heating, keeping your zero and vertical dispersion in check during high-volume varmint sessions. Harmonic Integrity: Free-floating the barrel under a rigid handguard reduces external pressures that can shift impact when you load a bipod or brace on a tripod. Repeatable Interface: Billet receivers and quality furniture produce a consistent cheek weld, trigger press, and support-hand position—the fundamentals that shrink groups. Ideal Use Cases (Where Lawful) Varmints & Predators: Prairie dogs, coyotes, and farm pests where precision and follow-up speed matter. Target & Steel: PRS-style practice, club matches, and long-range days where a stable gas-gun shines. Ranch/Property: A dependable, accurate .308 for wide-open ground and wind. Setup Tips for Best Performance Optics: Pair with a 3-15×, 4-16×, or 5-25× scope in a quality one-piece mount; confirm torque and level. Support: Add a swivel or cant-adjustable bipod at 6 o’clock; consider an Arca/M-LOK® plate for tripod work; keep a small rear bag in your pack. Zero & Dope: Most shooters choose a 100-yard zero for precise data; true your ballistic solver with real chronograph velocities. Ammo Vetting: Test multiple loads (e.g., 155–175gr match, 125–150gr varmint) and record group size, velocity (SD/ES), and POI—stick to one lot number for season consistency. Specifications Manufacturer: Rock River Arms (RRA) Model: LAR-BT3 Varmint Caliber: .308 Winchester (consult owner’s manual regarding any 7.62×51 NATO use) Capacity: 20+1 (magazine dependent; observe local laws) Barrel: 20" stainless bull (heavy contour), free-float Handguard: 17" M-LOK® free-float Receivers: Billet upper & lower, black finish Stock: OEM NSP-2 carbine stock (adjustable) Grip: Hogue® OverMolded beavertail Controls: Standard AR layout (safety, mag release, bolt catch) Model #: XBT31521 UPC: 842834119752 Exact trigger, gas system, and muzzle device may vary by production lot/dealer package—check your retailer’s listing for included components. What’s in the Box* RRA LAR-BT3 Varmint .308 Win (20") (1) Magazine (type/capacity may vary by state/dealer) Owner’s manual & lock *Contents can vary by shipment; verify the retailer’s listing. Care & Maintenance Break-In: Follow RRA’s recommended procedure for stainless barrels to speed seasoning and cleaning. BCG & Gas System: Keep the bolt carrier group lightly lubricated; inspect gas key screws and staking periodically. Fasteners: Re-torque rings, mounts, and M-LOK® hardware after the first live-fire session; use thread treatment as recommended. Cleaning Cadence: Stainless bores clean quickly—use a bore guide, quality solvent, and non-marring tools. Safety & Compliance Know Your Laws: Magazine limits, feature restrictions, and hunting rules vary—confirm local/state/federal compliance before purchase and use. Safe Handling: Verify clear before cleaning or transport; use quality eye/ear protection and follow all range commands. SEO-Friendly Keywords (Use Naturally on Your Product Page) Rock River Arms LAR-BT3 Varmint, XBT31521, .308 Win varmint AR-10, 20 inch stainless bull barrel .308, billet receiver 308 rifle, 17" M-LOK handguard, Hogue OverMolded grip, NSP-2 carbine stock, precision varmint rifle .308, UPC 842834119752. **Built to hold tight when the barrel gets hot—**the RRA LAR-BT3 Varmint (.308 Win, 20" stainless bull, billet receivers) is a purpose-built accuracy rig that turns long strings into small groups and distant specks into clean hits. The End