It's possible that someone has replaced the recoil spring with one that is powered to handle 9mm ammo. IIRC, there are fewer coils on the ones used with .30 Luger.
If you get a chance, carefully remove the grips (be quite careful about not breaking the left one up at the safety lever), and count the coils on the spring...
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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