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Phil, The S&W M&P Sport II has a carbine length gas system on this DI setup.

Phil, this rifle has a Carbine Length Direct Gas Impingement System. (( Complete Specifications and Features)): - Smith & Wesson Military & Police 15 Sport II Magpul MOE M-LOK 10305 - AR-15 Semi Automatic Rifle - Carbine Length Direct Gas Impingement - 5.56mm NATO caliber (accepts .223 Remington) - 16" B4140 Steel Barrel - 1:9" Twist - M4 feed ramps - 7075 T6 Aluminum upper and lower receivers Mil spec hard coat anodized black - Adjustable A2 front sight post - Magpul MBUS folding rear sight - 6 Position telescopic stock - Magpul MOE Carbine Length M-LOK Hand Guard - Chromed Gas key and bolt carrier - 30 round magazine - Overall length 36.8" Extended / 32" Collapsed - Overall weight 6.45 lbs - Made in the USA. Matte Black