I’ve seen US military M80 Ball with both GM and GMCS jacketed bullets. As I recall, the GM specimens were Vietnam War era, with headstamp dates in the late 1960s, while I have seen GMCS examples with 1990s headstamps.
Does anyone know if M80 Ball is still produced (by Lake City, or ?) with GM jackets, for the US Armed Forces?
If all current/recent production is GMCS, when was GM last made?