Brownells Barrel Align Gauge Features The Brownells Barrel Align Gauge for .40 Smith and Wesson and 10mm works by sliding down the bore of a 1911-pattern barrel until its centered tip locates the firing pin hole. On a correctly fitted factory barrel the tip drops cleanly into place giving an immediate confirmation of alignment. A light coat of layout fluid on the breech face before testing makes even minor misalignment visible which is useful both for verifying a fresh build and for inspecting a used pistol. This straightforward test avoids the need for more involved gauging equipment. Machined from centerless ground steel and measuring 8-1/4 inches long the gauge is built to hold precision through repeated bench use. It is part of a set that also covers .38 Super and .45 caliber 1911 barrels giving gunsmiths coverage across the most common 1911 chamberings. Dealers evaluating trade-in pistols can use it as a fast low-cost check for barrel fit problems before a sale. Anyone who regularly works on 1911 pistols in .40 or 10mm will find this gauge speeds up quality checks considerably. Brownells 1911 Barrel Align Gauge Specifications Brand: Brownells Model: 1911 Barrel Align Gauge Caliber: .40 SW / 10mm Material: Centerless Ground Steel Length: 8-1/4 Compatible Hosts: Smith and Wesson Available At: GrabAGun