Relevant to my interests:

As you can see, you with the pictured adapter you can couple 2 Magpul PMAGs base to base to get a maximum of 60 rounds (2 30 round magazines). You get a new longer spring of course with the coupler.
You can get the coupler from the source California Competition Works for $45 – HERE
Ridiculous looking, but awesome. It would be hilarious if someone came up with an coupler for the 100 round surefire aluminum magazines.

Want. Simply because longer magazines are cooler than drums any day
Like the 1911 for example. You could go with a flat 50 round drum, or have an awesome six foot long magazine with the same capacity
I just wonder how well the dust cover on the bottom mag withstands the pressure on it with 60 rounds loaded.
i dont get it. why do they go base to base but only feed one way? this just seems like a stupid dangerous design. so the spring pushes against the inside of the feed lips of one of the mags? what happens if you try to insert the wrong side?