The question can't be answered as written. What purpose will it be used for?
no the m1garand <><><> There is no ONE "Best" gun.
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Ray Gun
The German 88mm
The longshot or longstrike
the best gun from WWII had to be either the trench gun(a shotgun) or the springfield. no questions asked. The most reliable are the lee enfield and the 7$ gun(stengun)
AK-47
"best" means nothing without metrics to measure against.
ak -47
the mp40 with stopping power/double tap is the best for cod5 MP.
The best gun in gta lcs is the m60
Most veterans and historians think it is the M-1 Grande