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The Geissele Suppressor Alignment Gage (SAG) is utilized to confirm that a suppressor is aligned with the bore of a firearm barrel. It is crucial to understand that the length of a suppressor is typically much greater than the length of the barrel, muzzle device, or suppressor interface geometry. Even a small deviation at the mount interface may result in a much larger deviation at the suppressor exit hole. Deviations from nominal can add up and make suppressor misalignment worse. The Geissele SAG is made from hardened steel, which has been ground to a diameter 0.002" beneath nominal bore diameter. Its outside diameter has been finished to a straightness of 0.001" across its length. Geissele hardens the SAG to ensure that it does not wear by sliding, become marred by misaligned baffles, or become embedded with abrasive particles. There may be considerable differences in barrel bore diameters and bore straightness. However, Geissele has discovered that the SAG's size, which is 0.002" below nominal bore diameter, is ideal for a majority of barrels. The SAG's lengthy dimension aligns the gauge with the bore, so it is not necessary for the gauge to have an extremely snug fit with Geissele's SAG.