I have built 2 AK-47 pistols from flats that I bent my self. Last weekend I bought 6 AK Receivers (just going into the safe for now) that were pre-made and had them transfered to me on a 4473. I asked about building them into pistols. The gunstore guy said that that was fine, but I must register them as pistols with the state (WA) and that I could get into some trouble for Manufacturing Firearms. Is this true?? I thought that If I bought a 100% receiver that it WAS the firearm, and I wouldent be manufacturing firearms, only adding parts to a "firearm"(the receiver is the firearm) am I wrong? any Legal reasons why I couldent sell off one or two of the pistols I build from the 100% receivers I bought? or would this be a bad Idea? Thanks!