I never saw any A4's in RVN. Given to the Viet Namese early on in 1963/64?? I did see and play with an M1D in Big Red 1 Firebase north of Saigon. Lots of D's in-country. I did see one M1903 in-country. Very uncommon as they were a very early-on gift to RVN. Lots of 98's and had a friend who a sniper 98!