* Definitely a "q" block. Mauser did not make 1937 dated P.08's in the "g" block to my knowledge.
* Finding the matching mag(s) is not impossible; but, is highly improbable.
* Lugers can be ammunition sensitive. Try your 115 grain UMC. If you have trouble, many find Winc. White box ammo solves their woes.
* Trust this helps.
Bob
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