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Hi William, this is a Mil-Spec Pistol Length Buffer Tube. This buffer tube assembly features a 5.5 oz buffer. Stay safe & have a great day!

No, A standard, full-length (also known as carbine-length) buffer tube, specifically Mil-Spec, is 7.25 inches long with an outside diameter of 1.148 inches.

Hi William and welcome. It is not Sir. AR-15 pistol buffer tubes are shorter and have a different outside diameter than carbine buffer tubes, with pistol tubes typically being around 5 inches long and carbine tubes around 7.25 inches. Cheers and stay safe!