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Its a direct impengment

Its a direct impengment "shooters prefer the lighter weight and affordability of a direct-impingement gun, and with their new AR-556, Ruger has delivered." https://www.gunblast.com/Ruger-AR556.htm

Jon, this rifle is "Direct Gas Impingement" Sir. --- ((Complete Specifications and Features)): - Ruger 8500 - AR-15 Semi Automatic Rifle - 5.56 NATO caliber(accepts .223 Remington) - 30 Round standard AR-15 magazine - 7075-T6 Aluminum forgings - 16.1" Cold Hammer Forged Barrel - Medium contour barrel - M4 feed ramps - Matte black oxide finish - 1:8" Twist rifling - Muzzle threaded 1/2"-28 tpi - Ruger flash suppressor - 9310 Alloy steel, shot peened and pressure tested bolt - Carbine length gas system - Milled gas block - QD sling swivel socket on gas block - Bayonet lug - Serrated, low-glare, A2-style, F-height front sight - Front sight tool included - Barrel Nut and Delta Ring are designed for one person handgua rd removal and installation - - Mil-Spec diameter receiver extension - Six Position Collapsible Stock - Ergonomic pistol grip with