My brother was a door gunner in 66-67 near Plekiu. They were issued M10s and shoulder holsters. He "found" a Browning Hi Power, and also a 45 cal Grease Gun, besides the bungi hung M60, and at one point during an extract, used all of them when the M60 failed, and thought it was going south for the ship. No one complained as long as he was firing.
He recently bought a 1911A and that is his first purchase since 1968 return from RVN.