I snagged one of these recently as well, cheap enough to play around with. I've got a broken lever changer I'm going to integrate and was planning to freak-bore - keep us updated how that goes!
Small things I also plan -
The ball follower in the magazine would bind less if it were made of delrin.
The feedgate on the magazine has an unnecessary oring (way too stiff to turn), it's much more usable with that removed. There is a ball-detent that gives a satisfying click when the gate is closed, but it's missing an equivalent notch for the open position (can actually open TOO far on mine and block reloading.) Simple fix with a drill-press to add another dimple.
Stuff for sale: Anti-rollout fingers
Originally Posted by The Flounder
We don't do easy here! Here we do different and not done before!
My feedback: MCB / eBay