Great Lakes Firearms GL-15 Features The Great Lakes Firearms GL-15 .450 Bushmaster rifle is engineered for durability and performance featuring an 18 barrel available in stainless or black nitride with a heavy contour for improved accuracy. The mid-length gas system enhances reliability and smoother cycling while the ported compensator helps reduce recoil. This .450 Bushmaster AR-15 rifle also includes a 15.25 M-LOK handguard with a full-length Picatinny rail for versatile accessory mounting. Built with a 7075 oversized upper receiver it maintains strength while keeping overall weight manageable. The collapsible stock and polymer grip provide comfort and control in various shooting positions. Designed for shooters who need power and modularity it delivers dependable performance in the field. Great Lakes Firearms GL-15 Specifications Manufacturer: Great Lakes Firearms Model: GL-15 Caliber: .450 Bushmaster Capacity: 5+1 Action: Semi-Auto Barrel Length: 18 Barrel Finish: Stainless or Black Nitride Barrel Contour: Heavy Twist Rate: 1:24 Thread Pattern: 9/16x24 Gas System: Mid-Length Muzzle: Ported Compensator Receiver: 7075 Aluminum Oversized Upper Handguard: 15.25 M-LOK with Picatinny Rail Stock: Collapsible Synthetic Grip: Polymer Safety: Selector Switch Hand: Right Weight: 6.4 lbs