The GLFA AR-15 in .450 Bushmaster is a semi-automatic rifle built on a 7075 aluminum frame with a Tungsten Cerakote finish. The 18-inch barrel has a 1:24 twist, which is the standard rate for .450 Bushmaster. Overall length is 35 inches and weight is 6.4 lbs. 
 

Key Specifications 

• Model: AR-15 
• Caliber: .450 Bushmaster 
• Action: Semi-Automatic 
• Barrel Length: 18 inches (1:24 Twist) 
• Capacity: 5 rounds (includes 1 magazine) 
• Finish: Tungsten Cerakote 
• Frame Material: Aluminum 7075 
• Gas System: Mid-Length with a 0.750 Gas Block 
• Grip: Mil-spec Polymer 
• Handguard Length: 15.25" Aluminum 6061 with Full Picatinny Rail 
• Muzzle Brake: Included (designed to be wrench tightened without Loctite) 
• Trigger Pull Weight: Milspec at 5.5 - 6 lbs 
• Overall Length: 35 inches 
• Weight: 6.4 lbs 
   

Detailed Features 

The mid-length gas system with a 0.750 gas block is a reliable choice for an 18-inch .450 Bushmaster build. The 15.25-inch aluminum 6061 handguard has a full Picatinny rail, giving plenty of surface area for accessories. The mil-spec trigger runs 5.5-6 lbs pull weight. The muzzle brake is included and is wrench-tightened -- no Loctite required. The 7075 aluminum lower and upper are the same material spec used across most quality AR-15 builds.

Owners of the GLFA AR-15 in .450 Bushmaster with 18-inch barrel and Tungsten finish generally respond positively, with a few consistent practical concerns.

Performance and reliability are the most common positives. The .450 Bushmaster caliber is well-regarded for hunting larger game, and owners report the rifle functions reliably across different shooting conditions. Build quality also comes up often -- the 7075 aluminum construction and Cerakote finish hold up under regular use, and the rifle feels solid.

The ergonomics get decent marks. At 6.4 lbs it is on the lighter side for a .450 Bushmaster AR platform, though some owners coming from lighter 5.56 builds note the additional felt weight. Customization gets positive mentions -- the full Picatinny handguard and standard AR-15 compatibility mean most accessories work without adapters.

The main criticisms are practical. Ammunition availability for .450 Bushmaster is more limited than mainstream calibers, and the cost per round is higher. Both come up consistently in owner discussions. Price is also mentioned -- some buyers feel comparable .450 Bushmaster ARs from other brands offer similar specs at lower cost, though most GLFA owners feel the quality justifies it.

For deer hunters in states that restrict rifle calibers to straight-wall cartridges, the .450 Bushmaster is a common choice and this rifle handles the role well.