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Its Piston operated Adams Arms P2 AR-15 Semi Auto Rifle 5.56 NATO 16" Barrel 30 rounds Piston Operated System 6-Position Collapsible Stock Black 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

Justin, this Adams Arms Rifle uses a Mid-Length Short Stroke Piston Operated System.

Hi Justin, This is a Mid-Length Short Stroke Piston Operated System

Its Piston operated Adams Arms P2 AR-15 Semi Auto Rifle 5.56 NATO 16" Barrel 30 rounds Piston Operated System 6-Position Collapsible Stock Black 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