ARs:
20" A2 Bushy - failure to feed 1 time with Wolf ammo in a mag that was dropped (I think rounds just shifted forward)
16" Bushy M4gery - 1 short stroke with Radway with someone else shooting (loose hold), no other issues
20" A4 Bushy - 1 short stroke the first round ever through it (BCG was gritty), never jammed again.
14.5" Bushy M4gery - never jammed
AR-10 - never jammed
Non-ARs:
AK-74 - failure to extract multiple times
SLR-106 - failure to feed 1 time with short 45gr ammo
Mini 14 - jam-o-matic
PTR-91 - never jammed, and it's shot some questionable ammo too
Saiga 12 - won't feed with pro-mags otherwise 100%
All other AKs have never jammed, but only 1, my Saiga SGL-20, can keep up with the ARs in accuracy.
Beretta 390 - never jammed
XD-40 sub - hates WWB 165gr ammo, failures to extract, 100% with everything 180gr.
Springfield 1911 A1 - won't feed hollow point ammo reliably
XD-45 and -9, Beretta 92 and 96 are 100%