Hey Brion,
No, the mag lips will not clear the bottom of the upper receiver, You will need to destroy a mag to do what you are talking about. A couple of guys are kicking around filling a 20 rnd w/ lead to add more weight to the platform for Benchrest shooting.
As far as the next batch shipping goes, I have been integrating customer feedback into the design, and have also redesigned several parts in order to help achieve a painless fit with the many lowers that I've encountered. Unfortunately this has pushed back the shipdate 'til Mid-November at the earliest.
Thanks again for everyone's feedback!
Chris Rosequist
Bohica Arms Corp