 The MK II was available in a number of barrel lengths; and lightweight barrels; , , and bull barrels, and and heavy tapered barrels.All guns with bull or heavy tapered barrels are Target models, and are equipped with target sights consisting of an adjustable rear sight and a taller, wider front sight, with an aggressive undercut to reduce glare.In 1999 18 versions of this popular pistol could be found in the Sturm Ruger catalog, and with over 2 million sold it eventually became the most prolific and well-liked .22 automatic pistol of all time.