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Hi David, Its chambered for 5.56 NATO accepts .223 Remington. Specifications and Features: Adams Arms P2 FGAA-00239 AR-15 Semi-Automatic Rifle Mid-Length Short Stroke Piston Operated System 5.56 NATO accepts .223 Remington 30 Rounds 16" 4150 CMV Barrel with a 1:7 Twist Threaded 1/2x28 with an Manimal Extended A2 Flash Hider QPQ Melonite and Black Nitride Barrel Finish 7075 T6 Aluminum Alloy Receivers A4 Flat-top Forged Upper Receiver Defiance Flip-Up Sights Free Float Adams Arms M-LOK Rail System One Piece Bolt Carrier with Integral Strike Face 6-Position Collapsible Buttstock Standard Trigger Black Hard Coat Anodized Overall Length 33" Collapsed Weight 7.16 lbs

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You can use both 5.56 NATO and .223 Remington.

The Barrel is "Stamped" 5.56NATO so it will fire both 5.56 and .223 without issue David.

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