Yes, your parts are mismatched. the Toggle train seems to have 04 whereas the rest of the gun's parts end in 54. The barrel does not look original, and I am not sure about the "GPGI HBG PA" stamp between the serial number and its suffix.
Looks like it will make a nice shooter, I am sure more people will chime in soon.
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-QM
Looking for Mauser S/42 toggle train #22
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