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pu are short 3.5 power scopes ............made really for the tokarev sniper rifle wich didnt pan out ...........then used after about mid 1942 on nagant bolt guns.
pe and pem scopes are the pre and early war scopes used on both top mount (PE) both about a 4 power scope similar looks to a modern scope.
OR SIDE MOUNTS (PEM) NAGANT RIFLES.
LOTS OF INFO on other sites as well.
i have both a pu and a pe nagant ( made up copies)
from don