(Disclosure: Canadian)
I just bought a SteelMaster and had to do a few tuning items to get the gun to RUN. First off, the C More was not fastened securely and almost fell off. Made zeroing the pistol challenging. Second, the 10 round mags were next to impossible to load 10 rounds into, and then the spring tension was so great that the pistol was choking up -failing to return to battery, jamming empties sideways and other shenanigans. In the end I had to file and sand each mags feed lips, cut one coil from the mag springs, and shave the bottom of the followers. While I was at it, I blended the mag well so that mags don't hang up on the nice ledge the build in there. There appeared to be issues with the extractor not managing the cartridge very well so I started smoothing it, then remembered I had an Aftec from another project so that went in. Finally I looked at the sear/hammer MIM sear (sigh) did a quick clean-up on the sear and left the hammer alone.
It seems to be happy now and has real potential. Time to start load development. Anybody have any loads for the SteelMaster in 9x19 minor?