Kind of a tie for me.
U.S. rifle, caliber .30, M-1(Garand) (Mine's an H&R)_
SMLE No.4, mk1* (Mine was made at Long Branch in Canada)
Of course, there was the ubiquitous Sten. ( roughly $1.50 per copy) Prolly killed more Gerry's than most of the others.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost