Great Lakes Firearms AR-15 450 Bushmaster 18" Rifle

Great Lakes Firearms AR-15 in 450 Bushmaster

This purpose-built AR-15 platform rifle chambers the potent 450 Bushmaster cartridge, a modern straight-wall round designed for hunters seeking rifle performance in shotgun-only zones and those who prefer the AR-15's ergonomics for medium to large game.

Barrel and Action

The 18-inch nitride-finished barrel features a 1:24 twist rate optimized for 450 Bushmaster ballistics. The semi-automatic action cycles reliably with a mid-length gas system and 0.750 gas block, providing smooth operation across a range of ammunition types. The barrel is threaded 11/16 x 24 and includes a muzzle brake designed for easy installation without thread locker.

Ergonomics and Handling

• Lightweight platform: 6.4 lbs overall weight makes this rifle manageable for extended hunting or sport shooting
• 15-inch M-Lok handguard: Full picatinny rail integration allows mounting of lights, lasers, or other tactical accessories
• Mil-spec polymer grip: Standard AR-15 ergonomics familiar to most shooters
• Oversized 7075 aluminum upper receiver: Precision-machined for durability and reliability

Magazine and Capacity

Ships with one 5-round modified magazine, appropriate for the 450 Bushmaster cartridge and compliant in most hunting regulations.

Specifications

• Caliber: 450 Bushmaster
• Barrel Length: 18 inches
• Overall Length: 35 inches
• Weight: 6.4 lbs
• Trigger: Mil-spec 5.5-6 lb pull
• Frame Material: 7075 aluminum
• Sights: None (optics-ready)

This rifle arrives without iron sights, making it an excellent platform for mounting your preferred optic or red dot sight.