Kaleo,
First, very good photographs. These help a lot.
I have never seen stampings in the location where the "Q" letters are on your receiver. I don't think that the factory would have stamped work marks there.
Also, the "353" on the barrel and receiver don't look like DWM dies to me.
My best guess is that the gunsmith that fitted the barrel to the receiver may have put the "Q" markings there to "sign" his work...
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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