This replacement Barrel 20" for the Ruger 10/22 is a HEAVY BULL BARREL, .920 diameter, crowned and button rifled, .22LR caliber, twist 1:16, BULL Barrel Contour, 416 Stainless Steel, Ported, weight 3.45 lbs. (3x4 column/row = 12 port holes)
Model: Ruger 10/22