The Great Lakes AR-15 .450 Bushmaster OD Green/SS rifle is a semi-automatic .450 Bushmaster from Great Lakes Firearms and Ammunition (brand part no. GL15450SSODG), offered in the OD Green/SS colorway. An 18-inch barrel with a 1:24 twist sits under a 15.25-inch aluminum handguard with a full Picatinny rail, on a 7075 oversized upper. The muzzle is threaded 11/16×24 and carries an included muzzle brake, with a mid-length gas tube and a mil-spec trigger at 5.5 to 6 pounds. One 5-round magazine comes with it and no sights are installed, which leaves the choice of optic to you. It measures 35 inches overall and weighs about 6.4 pounds, a handy size for a big-bore hunting carbine.

Key Specifications

• The rifle is chambered in .450 Bushmaster, the cartridge this build is designed around.
• Barrel length is 18 inches, which sets the handling and the overall length.
• Rate of twist is 1:24, the rate the maker pairs with the .450 Bushmaster.
• The muzzle is threaded 11/16×24, the pitch to match when you change muzzle devices.
• A muzzle brake is included, set six degrees forward and wrench tightened without Loctite to help manage recoil.
• Capacity is 5 rounds with one magazine included, so it is ready to load out of the box.
• The handguard is a 15.25-inch aluminum 6061 design with a full Picatinny rail for mounting accessories.
• The trigger is a mil-spec unit with a 5.5 to 6 pound pull, a predictable break for field and range work.
• Overall length is 35 inches, as the maker publishes it for this rifle.
• The finish is Cerakote, shown here in the OD Green/SS colorway.

Frequently Asked Questions

Is the safety selector ambidextrous? No. The maker lists the safety on this rifle as not ambidextrous.

How long is it and how much does it weigh? The maker lists an overall length of 35 inches and a weight of about 6.4 pounds.

What barrel length and twist does it have? It has a 18-inch barrel with a 1:24 twist.

Buy the Great Lakes AR-15 Rifle, .450 Bushmaster, 18-Inch, OD Green/SS, 5-Round, with Muzzle Brake

A semi-automatic .450 Bushmaster with a muzzle brake and no sights installed leaves the optic and the load development to you. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more from Great Lakes and the rest of our AR rifles while you are here.