It's usually used in the army.
Assuming you're referring to the US Army, and assuming you mean "gun" to refer to small arms, it's still the M16.
to shoot terriost and children
yes it is
Hand guns and Long guns.
Visit the Anzac Parade in Canberra, Australia
The Landscapes of the Australian Outback
The Wildlife of Australian Waterholes
Common Translation Mistakes from Australian to American English