If it shoots and cycles properly, you did just fine.
The "41" is the year the upper was made. The "42" is a concealment code for Mauser. It's a Mauser made upper from early in the year before the concealment code changed to "byf".
The frame looks DWM or early Mauser (1935-1937) to me. Is the side plate marked "92" inside toward the bottom, or does it have a number like "93" in the flat area? Of course, "49" on the outside flat area.
The serial on the front of the frame is out of focus, but looks like it may have been ground and renumbered. The side plate could confirm the original number, and manufacturer if it's matched to the frame.
You'll learn a lot by reading our FAQ document.
BTW, you have the best shooting magazine already. The milled Haenel Schmeisser magazines are very high quality.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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