Amazing how many you can remember when you think back. Ahh, the advantages of hanging around a machinegun dealer.
HK 21, belt-fed 7.62
MG42
AOC Thompson 1928AC
Savage Thompson 1928
Erma MP40
HK MP5 A3 9mm, two or three different ones
HK MP5 A3 40 Smith
HK MP5 A3 10mm
HK MP5K PDW
HK UMP 45
M14
M16, two or three different ones
Steyr AUG
American 180, 177 round 22LR
Ingram Mac, 4 different ones in 9mm
Ingram Mac 10, 45
Ingram Mac 11, 380
Uzi
FN P90
Missed out on the Ma Deuce. I couldn't go that day, and they had the headspace wrong and blew a case in the chamber.