Re: MR1 bolt...
For what its worth, I didn't think the Terminus Bolt was all that great, and I really wanted it to work so I could ditch the electric hopper. I had air flow issues with it initially as the air hole wasn't quite in the right place (fixed with a little bit of drilling). Once that was fixed, it helped, but it still would occasionally chop with the gravity even after it had been broken in. Pretty much the electric hopper was the only thing that stopped chopping completely and I eventually gave up on it as more trouble than it was worth. On the plus side, it was a lot lighter and reduced the kick noticeably. I would suggest a 2 o-ring delrin bolt which I think ACP still makes.
If you really want one, I've got one somewhere I can dig up and sell you.