I'm having a fireing problem.

[octam]

Hello gentelmen, new member first post. I bought my first luger p08 a few weeks ago. (1916 erfurt 6210 all match but mag, has been reblued) shooter not collecter. I got to shoot it last weekend and had a problem. I loaded 6 rounds in the mag that came with it, shot it and what i call the bretch did not full move forward to load a new round. i popped it forward and shot the next five rounds no problem. i thought maybe bad mag. i used another mag loaded 6 rounds and it shot fine. I loaded 6 more rounds in same mag and it didn't fully close again. (recoil spring possibly) I love the way it felt shooting it.
It shot pretty well for it's age.

I have been lurking around the forum for awhile and found that you guys are very informed on these pieces of art and tell it like it is.. please help me fix this problem..

thanks, George D.