The Armalite Defender 10 is a semi-automatic rifle chambered in .308 Win (7.62 NATO compatible) with a 16-inch double-lapped chrome-moly steel barrel at a 1:11.25 RH twist rate. The upper and lower receivers are aluminum, matte black anodized. It ships optic-ready with no iron sights -- a MIL-STD 1913 rail gas block handles optic mounting. The collapsible stock adjusts for length of pull. 
 

Key Specifications 

• Model: Defender 10 
• Manufacturer: Armalite 
• Caliber: .308 Win (7.62 NATO compatible) 
• Barrel Length: 16 inches 
• Capacity: 20 rounds 
• Weight: 7.9 lbs (126.4 ounces) 
• Finish: Matte Black Anodized 
• Type: Semi-Automatic Rifle 
   

Detailed Features 

• 16-Inch Double-Lapped Barrel (1:11.25 RH Twist): Lapping improves bore consistency; the twist rate works with common .308/7.62 bullet weights. 
   
• Chrome-Moly Steel Barrel with Anodized Aluminum Receivers: Durable and relatively light combination for a .308 semi-auto. 
   
• MIL-STD 1913 Rail Gas Block: Standard rail for optic or accessory mounting. 
   
• Collapsible Stock: Adjusts for different shooter builds or gear setups. 
   
• 20-Round Capacity: Standard .308 AR-pattern magazine.

Feedback on the Armalite Defender 10 in .308 Win generally highlights the build quality and reliable semi-auto operation. The matte black finish holds up well, and the .308 caliber versatility -- hunting, precision work, defensive -- gets consistent mention as a reason people choose this platform.

At 7.9 lbs, it's on the heavier side for a 16-inch rifle, and that comes up in discussions about handling in dynamic or extended carry situations. Price competitiveness against similar .308 semi-autos is a recurring debate point; some shooters feel the market has options at comparable quality for less. Those who buy it often discuss aftermarket upgrades, which is partly a function of the AR-platform's customization culture and partly an indication that the stock configuration leaves room for improvement by preference.