Great Lakes GL-15 RIA .450 Bushmaster 18in 5rd

The Great Lakes Firearms GL-15 RIA is a semi-automatic AR-style rifle chambered in .450 Bushmaster with an 18-inch barrel. It ships with a single 5-round magazine and uses a detachable magazine feed. The rifle features an M-LOK aluminum handguard, a synthetic adjustable stock, and a black Cerakote finish. Some published measurements and component materials differ between sources; see notes for items needing review.

Key Specifications

• Chambered in .450 Bushmaster.
• The barrel measures 18 inches.
• The action is Semi-Automatic.
• Barrel twist is 1:24″.
• Includes a single 5-round magazine.
• Equipped with a detachable magazine.
• Handguard is an M-LOK aluminum design.
• Stock material is synthetic with an adjustable configuration.
• Finish is black Cerakote.
• Includes a muzzle brake.

The GL-15 RIA integrates a large-caliber chambering into a familiar AR platform, offering modularity and a controllable magazine configuration for applications that benefit from a heavy-bullet option. Its M-LOK handguard and mil-spec controls provide a straightforward foundation for shooters seeking a practical, no-nonsense rifle platform.