Non German guns used by Germans in WWII

The Germans used weapons captured from the various countries they conquered to supplement their own weapons supply.
I just obtained a prewar French Mas 36 and stamped in small letters just under the serial number in the stock is a small stamp, LK5.
The theory is that this is either a German capture & check mark or possibly a German unit assignment stamp. However there are apparently no German documents known so far to prove this theory.
A number of rifles from various countries which the germans fought or took over have been observed having a similar stamp there, either having a LK5 stamp, or other numbers after the LK. The French ones know with that stamp, all have the LK5. There is even a British Enfield having this stamp.

In an attempt to find more guns having this stamp to help add weight to the theory, could folks with prewar or WWII period guns other then German made ones, look to see if that stamp is present on their gun. The stamp is quite small and could be missed easy. It is usually located on the butt stock near the butt plate. Thanks for any help. Ray

 

I have two huge (when I say it I mean it) encyclopedias, one on tanks and the other on rifles, mortars, grenades and machine guns. The first is from WWII to the present, while the second is from WWI to the present.

After reading the page about the PPSh-41, it said that after Moscow German troops were able to scavenge the weapons after running out of ammunition for their own rifles/machine guns. Soon Germany began producing the rifles by themselves, and a battalion of infantry in Berlin (can't remember which ) was equipped with them fighting Russians. Must've confused the Commies, huh? :O

 

Thread moved to Information Request Forum.

 

The PPSH was definitely a German favorite.