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The Alpha Maxx 300B 16" 60Rd Mag rifle uses a standard AR-15 gas system.

Hi Jeff and welcome. this model has a "Carbine" length Gas System. Cheers and stay safe!

Hi Jeff, since ATI does not specify (and they have a very similar rifle that uses a pistol length system) I would ask ATI direct at 800-290-0065 or email customerservice@americantactical.us Pistol length model here >>> https://www.primaryarms.com/american-tactical-inc-alpha-maxx-300-blackout-ar15-rifle-16in Available at Bud's here https://www.budsgunshop.com/product_info.php/products_id/177749/ati+alpha+maxx+.300+black+16+30+1 , Stay safe & have a great day!