BF2S Forums 120MM gun???

Sometimes it says

[Teamkills-ARTILLERY] Nub

Then I check on the scoreboard and Nub is still alive. Also, I changed the localization files to have the technical names for the arty, and made it so the TK message shows what weapon the victim was killed with. It normally would say:

[Teamkills - M-777 Artillery] Nub

I've also seen

[25MM GUN]

and

[COAXIAL MG]

OK there is only one of a few things going on right then.

a: the original poster shot the guy with the aircraft cannon (which should be 20mm) and there is some bug that added a 1 to the 20, or EA mistyped it or something

b: the original poster actually caused a 120mm cannon (i.e. arty?) to blow up, thus, it was the 120mm cannon that killed the player, not the original posters rounds

the big question is, what is 120mm (other than the m1a1?)