aren’t 30 shot magazines prone to jamming?
Not that I have found. At least not high quality ones such as PMAGs from MAGPUL.
No, its the 100 round drum mags that are prone to jam just like it did in the Colorado theater shooting.
Mine don’t. I had one where I bent the feed lips on it that I tossed, but magazines are a “consumable” part anyway. You are supposed to replace them when they start to wear out.
No.
Yeah, that's why you load 28 rounds into it.
Nope. Never had a minute’s problem with them.
USGI 30rd and Magpul PMAG 30, plus a couple of other specific brands, are extremely reliable.
Go with a belt fed weapon and no problem.
Not AK-47 7.62
Regardless of capacity, poorly designed, poorly constructed, or damaged magazines may contribute to feeding problems. Well built magazines in good repair tend to work just like they're supposed to.
Some drum magazines have been around for a long time, for the Thompson, the PPSh-41, etc., and the design and manufacturing issues were resolved a long time ago.
Drums for ARs tend to be more recent developments and some do have a reputation for jamming. I suspect it's largely a matter of manufacturing tolerances, materials, and perhaps some inherent design issues. Eventually, I suspect those would be resolved (if the market is allowed to survive.)
No. Not even a little bit. Where did you get that idea?