What's your definition of "feeding problems"? Feeding 1 cartridge? 3? 5? 20+?
If you want an AR that feeds well (i.e. an entire 30 round mag), you are barking up the wrong tree with the .350. It wasn't designed to be a great feeder, it was designed to give people in straight wall states an option and feed "good enough" for hunting.
350s are very ammo sensitive. If you can find an ammo that feeds 3 in a row you are GTG.
If you want something that feeds well enough for SHTF, look at a bottlenecked cartridge like the 5.56, something that has some body taper.
