The Great Lakes GL15 in .450 Bushmaster (brand part no. GL15450BRZ) is a semi-automatic AR-15-pattern rifle built for big-bore hunting, pairing an 18-inch threaded barrel with a 1:24-inch twist rate matched to heavy .450 Bushmaster bullets. Great Lakes builds the rifle on an oversized 7075 aluminum upper receiver with a 7075 frame, threads the muzzle 11/16×24 for the included muzzle brake, and runs a 0.750 gas block with a mid-length gas tube for smooth cycling. A 15.25-inch full-picatinny aluminum handguard, mil-spec polymer grip, and a 5.5-6-pound mil-spec trigger round out the build, and the rifle finishes in bronze Cerakote. The rifle ships without sights and feeds from an included 5-round magazine. Among AR-platform rifles in the AR rifles category, the GL15 favors hunters who want a big-bore straight-walled cartridge in a customized AR build.

Key Specifications

• Chambered in the big-bore .450 Bushmaster cartridge with a 1:24-inch twist.
• Features an 18-inch barrel threaded 11/16×24.
• Built on an oversized 7075 aluminum upper receiver.
• Includes a muzzle brake, factory-installed at 6 degrees forward.
• Runs a 0.750 gas block with a mid-length gas tube.
• Includes a 15.25-inch M-LOK aluminum handguard with full picatinny rail.
• Uses a mil-spec 5.5-6-pound trigger.
• Feeds from a 5-round magazine, one included.
• Overall length is 35 inches, weighing approximately 6.4 pounds.
• Finished in bronze Cerakote.

Frequently Asked Questions

Does this rifle include a muzzle brake? Yes, factory-installed and torqued to 6 degrees forward.

What gas system does this rifle use? A 0.750 gas block with a mid-length gas tube.

Buy the Great Lakes GL15 .450 Bushmaster

A big-bore, custom-built AR rifle for serious hunting is exactly what the GL15 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.