Given my proximity to the GI, I am familiar with the term "chopper"
Chopper is a slang term for a weapon that closely resembles an assault weapon as defined by the 1994 assault weapons ban, usually referring to a Kalishnikov pattern rifle.
(see also: heater, gat, piece, strap)
"Glocks are good guns but, in a gunfight, being as how they are all plastic, when they get hot, they jam".