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Hi Michael, It's Gas. The A3 upper receiver and gas block allow quick attachment of either optics or detachable Iron sights. Specifications and Features: DPMS Oracle Semi Auto Rifle 7.62 NATO chamber (accepts .308 Winchester) 16" 4140 Chrome Moly Steel Barrel with .308 A2 Flash Hider 20 Rounds Black Finish 1/10 Right Hand Twist Gas Operated A3 Style Flattop Upper with Hard Coat Anodized Teflon Coated Black Billet Hard Coat Anodized Lower Standard AR-15 Trigger Group Optics Ready DPMS 6 Position Pardus Stock Carbine Length GlacierGuards 8.3 lb's 36.38" Overall Length

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This rifle uses the "Impingement" System Michael.