I added a pistol to the pile today. It is a Ruger Mk 4 22/45 Lite. It has adjustable sights and a barrel threaded for a silencer. Weight is 25 oz. with an aluminum receiver. Over the years, I have had several of the Ruger 22 pistols and decided that it was time to add a new one. Take down is simple compared to the Mk 1-3 guns. All that is required is to make sure the pistol us unloaded, cock the pistol, put on the safety and press the take down button at the rear of the receiver. The barrel assembly tilts up (like opening a dbl bbl shotgun) and lifts off the receiver. The bolt simply pulls out the rear of the barrel assembly. Putting it back together is just as simple. Can't wait to take it to the range and put it thru it's paces! Some pics.