I had one of these. Nice gun, but it was very tight. it would not feed some 10mm ammo reliably, PMC, hornady.
Once i put 500 rounds through it, it functioned better. They have very tight chambers, i polished the lower portion of the chamber and ramp on the barrel. I did not remove any metal, only polished. this took care of the problem.
good luck. They make a nice carry gun.