Maybe is just paid real good attention to the guy in the campaign hat at Ft. Knox, or maybe it comes from having a plethora of crappy magazines for my Mini-14 growing up, so seating magazines properly is ingrained into my psyche, but I never had a problem with the straight magazine well on the M-16/M-4 series of rifles.
Granted, I was issued some really, really crappy mags when I first got to my unit, but that was fixed with a run to Bass Pro and ten PMAGs.
Honestly, this is the first I've read of the straight magwell thing.
NRA Life Member
"Had King Kong showed up in Texas, Frank Hamer would have taken him down with his Model 8 in .35 Remington...well, he was kind of big, so maybe his BAR"