Alright, here's the deal:
I took a little Dremel bit and rounded out the breech. Then I took two of my rotary mags and filled them up full. So I went out and shot off the two mags in the yard, finding the gun to work GREAT. But I did have problems with the mags. The rounds wouldn't advance, and I'd have to take the mag out and tap it a bunch each time that happened, which was about 3 times a mag.
So then I came back in and tightened one of the mag springs. Tried it again. Same, maybe a little better. Then I tightened a little more, as well as leaving the screw very slightly loose, to make sure I wasn't squeezing the rotor thingy. Same, maybe a little better. I have tried cleaning as well, which does help, at first. Maybe I just have to clean them every 200 rounds or something.
But I'm going to to town tonight, I'm gonna go to the local place and get ammo and a BC mag. Maybe even another mag if I see one. I just want to find the very best one. And I can always give one to my brother.
So, thanks for the tip on rounding out the chamber, I think that helped reduce jamming rounds, being I had none after firing 50 rounds or so.