Luger Strength

[Big Norm]

PaulH,
John has pretty good advise. I just would like to add that the ammo will sometimes screw up a luger. Once I went to an indoor range and had to use their ammo. It was under powered and the bullet fouled up the barrel. My Lugers continuously jammed and I spent more time clearing my guns than shooting.
I have heard that there are instances of the extractors breaking but it has never happened to me personally. After having a number of Lugers, I finally got one that appears to need a new main spring in the handle. All in all, given the age of these guns, I would say that that is a pretty good track record.
Basically, there are three things to be careful of. (1) dirt
(2) weak magazine (never use an original)
(3) bad ammunition
Watch these three things an you are pretty well assured of some happy shooting. I only mentioned not using the original magazine because of its collectiblity. An original will probably work but why screw up an original collectible piece.
Big Norm