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This variant of the Ed Brown barrel is threaded for use with suppressors and is longer than the standard drop-in barrel. The thread size is 0.578 x 28 tpi RH and it comes with a link, link pin, bushing, and thread protector. The key to its accuracy lies in the high-quality materials and manufacturing process used by the manufacturer. They use T-416 modified, gun barrel quality stainless steel bar stock, which is stress-relieved and heat-treated before rifling and refinishing. Ed Brown barrels are precision machine cut from a 3-pound chunk bar of this top-quality steel. They are rifled using precision broaching technology in the original six lands and grooves, one turn in sixteen left-hand twist, as originally designed by John Browning. This deep cut, broached rifling provides excellent accuracy with all bullet types, including lead. Ed Brown barrels undergo heat treatment and sub-zero freezing by an aerospace-certified facility for added strength and stress relief, resulting in more accuracy and longer barrel life. The dimensions of the barrel have also been precision cut to max tolerance on the outside, reducing the fitting work required for the user and further enhancing accuracy. Please note that a suppressor equipped with a Nielsen device (like 276-000-055) is necessary for reliable use in a 1911. The Nielsen device is sometimes called a booster, kicker, or Linear Inertial Decoupler.