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(3oz) - This AR-15 receiver extension (buffer tube 3oz) (Carbine Length) from Bravo Company is machined from 7075-T6 aircraft aluminum and Mil-Spec hard coat type III anodized black. It is manufactured to Mil-Spec dimensions and specifications. Mil-Spec receiver extensions have a slightly smaller diameter than commercial at the point where the stock slides on, so be sure to choose a Mil-Spec stock to use with this tube for the best fit.