I put a hundred rounds of Federal FMJ through it today. It's very accurate, makes decent groups for a first time out. The mags wouldn't load all 10 rounds at first, but one loosened up enough. I'm storing them with 9 so the springs will relax a little. Some trouble feeding the last round a couple times, but that stopped after a couple mags.

The grittiness probably comes from the contact surface of the striker block plunger (if that's the right name for the plunger in the slide). It's "textured." It will be polished.