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

The Great Lakes Firearms AR-15 .450 Bushmaster is a purpose-built rifle for hunters and shooters who want serious stopping power in a modern, versatile platform. Chambered in .450 Bushmaster—a cartridge renowned for short-to-medium-range hunting and barrier-blind performance—this 18-inch rifle delivers the leverage of a straight-walled cartridge in a configuration that handles like a traditional AR, making it an excellent choice for hunters transitioning from .223 or those simply after a hard-hitting, manageable package.

Built on a 7075 aluminum frame and oversized upper receiver, the rifle balances weight and durability. The 18-inch barrel sports a 1:24 twist and comes threaded 11/16 x 24 with a muzzle brake already installed—no wrench-on-with-Loctite hassles. You get your choice of barrel material (416R stainless steel or 4150 CRMOV with nitride finish), a mid-length gas system anchored by a .750 gas block, and a full Picatinny rail on the 15.25-inch aluminum handguard for mounting optics, lights, or accessories. The rifle ships in ODG (Olive Drab Green) Cerakote, adding a rugged aesthetic to a practical tool.

At 6.4 pounds and 35 inches overall, it's maneuverable in brush and trucks without feeling like a toy. The trigger breaks at a mil-spec 5.5–6 lb pull, suitable for hunting and field work. Modified M4 feed ramps ensure reliable feeding, and the aluminum Mil-spec grip is ergonomic and proven. You'll receive one 5-round magazine to start—appropriate for most hunting regulations and the cartridge's ballistics. No irons are included; plan for an optic or add your own sights.

This is a no-frills, well-engineered .450 Bushmaster that respects the cartridge's strength and the AR platform's modularity, ideal for serious hunters who understand the round's real-world capabilities and limitations.

Key Features

• Semi-automatic AR-15 platform chambered in .450 Bushmaster
• 18-inch barrel with 1:24 twist; choice of 416R stainless or 4150 CRMOV nitride finish
• Threaded 11/16 x 24 muzzle (brake included)
• Mid-length gas system with .750 gas block
• 7075 aluminum frame and oversized upper receiver
• Full Picatinny rail handguard (15.25 inches) for optics and accessories
• Mil-spec trigger and polymer grip
• ODG Cerakote finish
• Modified M4 feed ramps for reliable feeding
• 5-round magazine capacity; one magazine included

Specifications

Frequently Asked Questions

What ammunition does the Great Lakes Firearms .450 Bushmaster rifle use?

.450 Bushmaster is a straight-walled, large-bore cartridge known for hunting medium to large game at moderate distances. It offers significant stopping power and is legal for hunting in many jurisdictions with straight-walled cartridge requirements.

Does this rifle come with sights or an optic?

No sights are included. The rifle features a full Picatinny rail on the handguard, making it ready to mount your choice of rifle scope, red dot, or other optic.

What's the magazine capacity, and how many come with the rifle?

The rifle is configured for 5-round magazines. One 5-round magazine is included with your purchase.

Can I customize or add accessories to this rifle?

Yes. The rifle ships with a Picatinny rail handguard, allowing you to mount lights, lasers, and optics. The threaded muzzle accepts aftermarket brakes or suppressors (where legal), and the AR platform is modular—you can swap grips, triggers, and other components as desired.