I have one of the 1st ones that is non pinned. I put S&W target stocks on it and took it to the range along with my K22 Combat Masterpiece. It shot just as accurate as the K22 Combat revolver.
I used to carry it in a cross draw holster on my Hondo 4 wheeler, but I bought a M&P 22 semi-auto and had no further use for the M63. My M&P 22 is super accurate and is my go to gun when riding. Big Larry