Great Lakes Firearms AR-15 .450 Bushmaster 18" Tungsten 5-Round Rifle

The Great Lakes Firearms AR-15 .450 Bushmaster is a purpose-built semi-automatic rifle engineered for hunters and shooters who want serious stopping power in a modern platform. Built on a 7075 aluminum upper and lower receiver, this 18-inch .450 Bushmaster rifle combines the familiar ergonomics and modularity of the AR-15 with a cartridge known for delivering deep, devastating impact on game. At 6.4 lbs, it's maneuverable enough for hunting from stand or on foot, yet substantial enough to handle the recoil and energy of a magnum-class hunting round.

The 18-inch barrel features a 1:24 twist rate and is threaded 11/16 x 24, giving you the option to add your own muzzle device or run the included muzzle brake—designed for tool-free installation without Loctite. The mid-length gas system and 0.750 gas block provide reliable function in a compact, rifle-length package. A 15.25-inch aluminum handguard with full picatinny rail gives you plenty of real estate for mounting optics, lights, or other accessories, while the modified M4 feed ramps and 5-round magazine capacity keep things running smoothly. The mil-spec trigger breaks at 5.5–6 lbs, and the mil-spec polymer grip is comfortable and durable. A single 5-round magazine is included, paired with the rifle's short 35-inch overall length—handy for hunting in thick cover or navigating tight spaces in a vehicle.

Finished in Cerakote and available with either 416R stainless steel or 4150 CRMOV nitride barrels, this rifle is built to handle field use. It ships without sights, so you'll want to pair it with an optic that suits your hunting style and distance preference. If you're looking for an AR-15 platform rifle chambered in .450 Bushmaster—a cartridge with genuine backbone for medium to large game—Great Lakes Firearms delivers a no-nonsense, purpose-driven tool.

Key Features

• 7075 aluminum upper and lower receiver for strength and durability
• 18-inch barrel with 1:24 twist, threaded 11/16 x 24 for muzzle device options
• Mid-length gas system with 0.750 gas block for reliable cycling
• 15.25-inch full picatinny rail handguard for optic and accessory mounting
• Included muzzle brake (tool-free installation, no Loctite required)
• 5-round magazine capacity with one magazine included
• Mil-spec trigger and polymer grip
• Compact 35-inch overall length and light 6.4 lb weight
• Cerakote finish; barrel options in stainless steel or nitride

Specifications

Frequently Asked Questions

What's the .450 Bushmaster cartridge good for?

The .450 Bushmaster is a magnum-class hunting round designed for medium to large game. It delivers significant terminal energy and is well-suited to hunting scenarios where you want a powerful, reliable round in an AR-15 platform.

Does this rifle come with sights or optics?

No. The rifle ships without sights. The 15.25-inch handguard features full picatinny rail, so you can mount any optic, red dot, or light setup that fits your hunting style and distance preferences.

What's included in the box?

You receive the rifle and one 5-round magazine. A muzzle brake is installed on the barrel and designed for tool-free installation without Loctite.

Is the barrel stainless steel or nitride?

Great Lakes Firearms offers this rifle with your choice of either a 416R stainless steel barrel or a 4150 CRMOV nitride barrel. Check the product listing to confirm which version is in stock.