Just another comment: Jim's reproduction recoil spring tool works GREAT! Sure beats the last time I took said spring out; that time it took a small screwdriver, both hands, one hip, and the lip of our slop sink to make things happen. Not to mention frequent references to that famous book "The Sailor's Guide to Magic Words and Incantations"!!
This time, with the proper tool, it was a snap! If you have a Luger, you NEED this tool!