Yeah. Drums are mostly range toys, but going by testimony from people who have them, they sound like they're the king of these toys. I've had the lust for one in the past, but the big pricetag and heavy weight (even having handled an unloaded one, they feel very beefy), puts me off each time.
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The novelty of rattling off lots and lots of rounds, and the comedic phallic visual (which I see pointed out whenever this image is posted on /k/), isn't enough to justify it to me in this economy, maybe when we'll see some cheaper steelcase become abundant again some day. The occasional bumpfiring with a pair of PMAG40s scratches the itch enough for me.
Supposedly, Armatac builds the things so that you can drop them onto the pavement or a concrete floor like any other mag and not have to worry about it getting damaged, which sounds plausible given the heft. I've seen C-Mags come apart from being dropped onto lawns or even from shorter heights onto shooting benches (scattering the ammo around), so there's a stark difference.
Have not tried those, but I have this vague memory of someone somewhere saying these things were no good. I don't know if that's true, and that's an unsubstantiated memory of someone's informal account, so don't take my word for it.
Having fiddled a bit with a commercial 7.62mm quad-stack mag for an AK, which didn't seem to want to behave with a Yugo, and having once attempted to load a Specter mag by hand (
probably meant to be loaded with a tool), I don't feel the most confident in them, but I'll also consider that many feel the same way with drums, many actually are junk, while I know for a fact that some are reliable performers, most famously the 9mm Suomi drum, thus I'll defer to those who have more experience with them.
I've heard some say that they have great luck with those SureFire 60 and 100 round mags, while I've heard others say they're trash, possibly this is a thing where individual mags may behave differently with different guns or even ammo. For instance, some Bushmaster receivers (not sure if before or after Remington), apparently don't want to let you seat C-Mags, without you relieving a bit of material somewhere, so I assume that things like these can be very conditional.
I guess ask your brother how they work, or if he lives nearby enough to borrow them to try them out.