Ok, thanks guys. I cut some grooves in the factory gas plug turning it into a tap (buying a tap is almost as much as a gunfixer plug)and it threads all the way in now, but is VERY tight.
The puck also wont go in. The factory puck goes down just past the last groove. I looked in the gas block and there is a ridge there, just before the opening to the gas ports. That's what it's getting caught up on. I tried honeing it with a brake hone, but it still doesn't want to go. I'm going to try putting some new pads on the hone (the ones on there are pretty FUBAR) and hitting it again... any better