Can someone help? I know nothing much about Ruger pistols and I am sitting here looking at a Ruger semi auto pistol .22 It looks like a MarkIII with tapered barrel. Does not say anything except "RUGER 22 cal. Long Rifle Automatic Pistol". It has an awkward clip release at the base of the grip, the release pulls back to release clip and the clip must be pulled out, it does not release or drop.