This Shaw barrel features a titanium tension sleeve over a 416R stainless steel core. This match grade barrel has a .875" diameter with a 1 in 16" twist. Featuring a Bentz chamber, this replacement barrel will facilitate reliable feeding for countless days of fun at the range. The Bentz chamber is a match-type chamber for semi-autos. It is not as tight as a true, minimum-spec match chamber, but is much tighter than a sporter chamber. You will see much better accuracy with standard ammunition (in the 1000-1400 FPS range). Note:CCI Stingers cannot be shot through the barrel, due to the chambering.