go to: gunbroker.com search 'luger'
go on internet and type in 'luger breakdown'
You can find original Luger magazines at gun stores, online firearm retailers, auction websites, and from private sellers. It's important to verify the authenticity of the magazine and ensure it is compatible with your specific Luger model.
the frame
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Go to http://stevespages.com/page7b.htm and scroll down to the "L" section. You can find a Luger manual there.
I believe you will find that the German Luger P08 went into production in the early 1900's. P08 basically refers to Pistol of 1908.The luger was used extensively during WW1 and WW2 by German forces.
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The .30 caliber Luger cartridge goes by several names which makes searching for it somewhat confusing. Originally it was named 7.65 Luger Winchester markets it under the name .30 Luger with a 93 grain bullet. Sako of Finland also markets the round with a 92 grain bullet. While not usually available in a WalMart one can find the round in a larger dedicated gunshop in the United States.
Obtain a manual from the maker or find a gunsmith
Try e-gunparts.com.
Gunshops and gunshows. Gunpartscorp is sold out of them.
Find a local gun smith and ask for help.