In the past, if you wanted to have a firearm with a Pac-Lite upper on it you had to fill out paperwork for 2 firearms. 1 set for the Ruger Mark series pistol and another set for the Pac-Lite upper. Then you were left over with an upper (which is the firearm according to the ATF) that you had no idea what to do with. Well thanks to Volquartsen Custom, this is no longer the case. They are now making complete frame assemblies which require no FFL to purchase. HERE is a link to the frames. 4 ounces for the bare frame means it's pretty darn light. Plus it comes loaded with all Volquartsen parts and ships with a 2.25lb trigger. Just thought everyone would like to know. It is a pretty exciting step in the rimfire pistol arena.