ON SALE! ROCK RIVER ARMS BT31755 308 WIN LAR-BT3 BILLET PRECISION 18" BBL

Rock River Arms BT31755, 308 Win LAR-BT3 Billet Precision with an 18 inch barrel, is a semi automatic AR-10 platform rifle built for shooters who want a billet receiver precision rig (BT31755) chambered in 308 Winchester and 7.62x51mm NATO. This rifle suits long range hunters, competitive shooters, and precision minded range shooters looking for a factory built AR-10 style 308 rifle that comes ready to shoot without aftermarket upgrades. Rock River Arms builds the LAR-BT3 platform around a billet receiver set paired with a fluted stainless barrel, giving buyers searching for a precision 308 semi automatic rifle a dependable option straight from the box.

Key Features

• Manufacturer part number BT31755
• Caliber 308 Winchester, 7.62x51mm NATO chamber
• Action type semi automatic, AR-10 platform
• Lower receiver RRA BT3 billet aluminum lower
• Upper receiver RRA BT3 billet upper
• Barrel length 18 inches, fluted stainless steel, 1 in 10 inch twist, cryogenically treated
• Muzzle device Operator muzzle brake, 5/8x24 thread
• Gas block low profile gas block
• Trigger RRA two stage Ultra Match trigger
• Handguard RRA lightweight aluminum free float rail, 17 inch extended length, M LOK compatible
• Buttstock Operator A2 stock, black
• Includes one magazine, RRA case, manual and warranty information

Special Features

• The billet upper and lower receiver set gives this rifle a machined fit that stands apart from forged receiver AR-10 rifles in its category.
• The cryogenically treated barrel relieves stress in the steel during manufacturing, which supports long term barrel life and consistent accuracy.
• Fluting on the stainless barrel cuts weight without giving up the stiffness a precision 308 rifle needs downrange.
• The RRA two stage Ultra Match trigger gives you a defined, consistent break that supports precise shot placement compared to a standard single stage mil spec trigger.
• The 17 inch free float M LOK handguard isolates the barrel from grip pressure and sling tension, helping the barrel perform consistently shot after shot.
• The Operator muzzle brake threaded at 5/8x24 lets you swap in a suppressor or other muzzle device compatible with that thread pitch.

Practical Benefits

• The 18 inch barrel length strikes a balance between the ballistic advantage of a longer 308 barrel and a rifle that stays maneuverable in the field or at the range.
• If you are looking for a 308 AR platform rifle that works for long range steel matches and hunting big game, this billet precision build gives you the accuracy potential and chambering to do both.
• The free float M LOK handguard lets you add a bipod, sling mount, or light exactly where you want it, so you can configure this rifle for prone precision work or field carry.
• The included RRA case and single magazine mean you have what you need to get to the range and start confirming zero without sourcing extra parts first.
• For a shooter who wants a 308 precision rifle that shoots accurately without a custom build process, this BT31755 gives you a finished platform you can trust on day one.

The Rock River Arms BT31755 308 Win LAR-BT3 Billet Precision rifle with its 18 inch fluted barrel stands as a solid fit for shooters who want a precision built 7.62x51mm AR-10 rifle ready for long range work.