UPDATE 12/6/16: Search of the forum resulted in a previous UniMag thread, apparently the guy who commented on the 1911 page is a member here!
http://www.450bushmaster.net/viewtopic.php?f=2&t=14980
Sorry bout that guys - looks like I've duplicated the information, still it seems to be another alternative in the market if you can catch the price just right or maybe a future iteration will be smoother operating...
Original post below:
I am awaiting my barrel / bolt to build the 450b Pigstix
Doing research on magazines, unhand I have two metal AR15 30 round *curved* mags with special red flat followers designed for 458 Socom. They worked fine for 458 and I figure I'll try them since they are onhand....
Also onhand is a 30 Remington AR 10 round mag from Healy Arm, anybody tried those?
And then by happenstance I bumped into a REVIEW for the RZE Unimag http://john1911.com/multi-caliber-ar-mag/ The reviewer is all about the mag for 450b - I wonder how many rounds it will hold and if it will work, kind of an expensive mag.....
If my onhand options don't work well I may try one.