The Barrel/Receiver assembly for my KMKIII6 (K-stainless steel, MKIII - Mark 3 or third generation of Ruger's .22 auto pistol, 6- six inch tapered barrel.) Note, I have not modeled the loaded chamber indicator because I don't like it. It was never noticeable in the first place, then it caused some jams, then it broke and sent shrapnel at my son who was shooting it. I've removed it and replaced it with a stainless-steel filler which looks real nice.