Identical to the standard drop-in Ed Brown barrel, but longer length and threaded for use with suppressors. Thread size is 0.578 x 28 tpi RH. Includes link, link pin, bushing and thread protector. Barrel accuracy comes from using the highest quality materials and manufacturing methods. Ed Brown Products is committed to both. The barrels are made from T-416 modified, gun barrel quality stainless steel bar stock, just like a benchrest rifle barrel. T-416 is certified pure, there are no foreign materials, and no hard or soft spots to worry about. It is stress-relieved and heat-treated prior to final rifling and refinishing. Ed Brown barrels are precision machine cut from a 3 Mfg: Ed Brown SPECS: Fits - Government or Commander Slides. Chambered in 45ACP, with a 1-16 twist. Muzzle threads are 0.578x28 threads per inch.