Help me identify this barrel marking

[phatrick88]

This should be an easy one for you guys. My luger is a '42' 1940. Just noticed that on the bottom of the barrel, under the four digit serial number there is a three digit number marked "8,82". I assume it's like a unit number or something from the war, but would like to know for sure. The more history I can find out about my gun the better. Thanks!