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I cant find a listing that states its mil-spec so I suggest that you contact TacFire for a accurate answer Phone: 909-628-4848 Email: support@tacfireinc.com

Hi Jackie and welcome back. This is a metal Mil-Spec Upper. Specifications and Features: Complete AR-15 Upper Receiver 5.56 NATO Barrel Length: 10" Barrel Twist Rate: 1-8 10" Free Float Handguard Threaded 1/2x28 Aluminum Handguard Aluminum Receiver A2 Style Muzzle Device Black Finish Cheers, stay safe and enjoy!