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

The Great Lakes Firearms AR-15 .450 Bushmaster is a purpose-built rifle for hunters who demand serious stopping power in an MSR platform. Chambered in .450 Bushmaster, this 18-inch rifle bridges the gap between tactical modularity and hunting effectiveness—offering the customization potential of an AR with caliber selection proven for medium to large game. With an 18-inch barrel, mid-length gas system, and compact 35-inch overall length, it's maneuverable in brushy terrain while maintaining the velocity and power the cartridge is known for.

Built on a 7075 aluminum receiver set with an oversized upper for solid lockup, this rifle comes configured for immediate use: one 5-round magazine included, full-length Picatinny rail (15.25 inches of 6061 aluminum handguard), and a muzzle brake designed for zero-loctite wrench installation. The 1:24 twist barrel is available in either 416R stainless steel or 4150 CMV nitride finish, both threaded 11/16x24. A standard mil-spec trigger with 5.5–6 lb pull and mil-spec polymer grip round out the controls. At 6.4 lbs, it's light enough for a day in the field without unnecessary fatigue.

Whether you're new to the .450 Bushmaster or adding to an existing .450 collection, this rifle's straightforward feature set—no frills optic or backup sights included—gives you a clean slate to configure exactly how you hunt. The modified M4 feed ramps and 0.750 gas block ensure reliable feeding and cycling with both factory and handloaded ammunition.

Key Features

• Oversized 7075 aluminum upper receiver for precise lockup and durability
• Full-length 15.25" Picatinny rail for maximum mounting flexibility
• Choice of barrel material: 416R stainless or 4150 CMV nitride, both 11/16x24 threaded
• Mid-length gas system with 0.750 gas block for reliable cycling
• Muzzle brake included; designed for wrench installation without thread-locking compound
• Modified M4 feed ramps for consistent feeding
• Compact 35" overall length and lightweight 6.4 lb profile for field use
• One 5-round magazine supplied; readily accepts aftermarket AR magazines

Specifications

Frequently Asked Questions

What's the .450 Bushmaster cartridge best used for?

The .450 Bushmaster is a dedicated hunting cartridge designed for medium to large game. It's particularly effective in AR platforms where hunters want increased stopping power compared to standard rifle cartridges, all while retaining AR ergonomics and customization.

Does this rifle come with iron sights or an optic?

No—this rifle ships with no sights. The full-length Picatinny rail on the handguard and receiver give you complete freedom to mount the optic, laser, or backup sights that suit your hunting or range plan.

Can I use standard AR-15 magazines with this rifle?

This rifle comes with one 5-round magazine and uses a standard AR magazine well. Magazine compatibility depends on the specific magazine model and .450 Bushmaster geometry; we recommend consulting with the manufacturer or a local gunsmith if you're uncertain about fit with aftermarket mags.

Is the safety ambidextrous?

No—the safety is right-side only. This is a common configuration on value-minded ARs; if you need ambidextrous controls, aftermarket safeties are readily available and easily swapped.