This Swenson Barrel for the Ruger 10/22 is precision reamed, button rifled and air gauged. Made from 4140R chrome moly steel, this heavy match barrel has a .920" 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. Note: CCI Stingers cannot be shot through the barrel, due to the chambering.