I’ve been waiting 9mos for Alexander Arms to ship 10 .50cal mags, and all I’m getting are email notes of backorder volume.
I have the original 10-rnd mag it came with, and 3 I made myself from AR-15 30rnd mags, by spreading the feed slips. Reliable 100% So I’ll modify some of the many 30-40 Bushy mags and one of the SureFire 60-rnd, to see how they work. Proprietary parts are a bitch.
Can’t go to NAPA, AutoZone or Cabellas and get them off the shelf.
People are buying those Alexander Arms mags because technically they are not a high capacity mag, but can be used as such should the need arise.
Disclaimer: Don't know anything about them - found on internets search.