Use ammo like Winchester's white box 115gn 9mm FMJ ammo you can find at Wal Mart and other sporting goods or gun stores.
Avoid anything surplus that might be machine gun ammo (it's rather hot) or things marked "NATO" standard. They are hot too.
Be sure to inspect and clean your Luger before and after shooting it.
I like WW-II era Lugers. The metallurgy was excellent and Mauser's workmanship was generally good.
Since the toggle train came from a different pistol, it would have to have been properly fitted to the receiver, frame, trigger plate and trigger. These were generally hand fit when a pistol was manufactured. There are very few good gunsmiths with extensive Luger experience.
How does the action and trigger feel? Is it reliable, tight and smooth?
Also, if you post pictures of your holster, including edge on views of the left side, the inside and out, we can let you know if it looks original or reproduction.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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