The Great Lakes Firearms GL10 is a semi-automatic rifle chambered in .300 Win Mag, built around an AR-10 pattern with upper and lower receivers machined from 7075 aluminum billet. The 24-inch stainless steel 416R barrel has 5R rifling at a 1:10 twist and is topped with a stainless steel muzzle brake (5/8x24 thread). Finish is Pursuit Green Camo. Weight is 9.25 lbs; overall length is 45.50 inches; capacity is 5 rounds. 
 

Key Specifications 

• Model: GL10 
• Caliber: .300 Win Mag 
• Barrel Length: 24 inches 
• Capacity: 5 rounds 
• Weight: 9.25 lbs 
• Overall Length: 45.50 inches 
• Finish: Pursuit Green Camo 
• Condition: New in Box 
   

Detailed Features 

• Barrel Construction: 416R stainless, 24 inches, 5R rifling, 1:10 twist. The 5R pattern reduces bullet deformation at the rifling transition compared to conventional land-and-groove designs. 
   
• Muzzle Brake: Stainless steel, 5/8x24 thread. Reduces felt recoil noticeably for a cartridge like .300 Win Mag, which helps with follow-up shots. 
   
• Receivers: Upper and lower machined from 7075 aluminum billet. The handguard has M-Lok slots and an upper Picatinny rail for optic and accessory mounting. 
   
• Stock: Hogue fixed rifle stock. 
   
• Gas System: Rifle-length gas system with a custom bolt carrier group designed for .300 Win Mag operation. 
   
• Trigger: Mil-spec, pull weight 5.5 to 6 lbs. 
   

Usage Scenarios 

A 24-inch barrel in .300 Win Mag is optimized for long-range work — this is a hunting and precision rifle, not a truck gun. The semi-auto action gives you faster follow-up shots than a bolt gun, which matters on large game. At 9.25 lbs it's on the heavier side for a field rifle, but the weight and muzzle brake together keep recoil manageable.

Owners of the Great Lakes GL10 in .300 Win Mag tend to focus on long-range accuracy, which is the rifle's main selling point. Most report tight groups at distance, and the .300 Win Mag cartridge is consistently praised for its reach and terminal performance on large game.

The semi-auto action gets positive marks for follow-up shot speed relative to a bolt gun, and owners note the cycling is smooth across standard .300 Win Mag loads.

The recurring criticisms are weight and bulk. At 9.25 lbs the rifle is heavy, and the camo finish — while useful for hunting — does add to the perception of bulk. Some buyers also wish for more aftermarket support and customization options.

Recoil management splits opinion. Shooters who come from bolt-action .300 Win Mag rifles find the muzzle brake and semi-auto cycling reduce felt recoil meaningfully; a smaller group suggests the design could go further. Overall, most owners consider it a solid semi-auto precision option in this caliber.