I don't think you will find the SP-101 in longer than 3-1/2" bbl. I had a .357 mag 5 shot and it was mechanically excellent. My eyes aren't so young anymore and I had trouble with the sights no matter what I dabbed on them to make them clearer. I only had a 2-3/4" bbl so the sight radius was very short: most of my variation was up-down, not much right-left. No malfunctions. No problems except unpleasant recoil when shooting .357 mag 158 gr factory. Worked great with all .38 spl loads I tried. I question the .32 mag cartridge but never had personal experience with one.