That "3" is an assembly and/or factory inspection number, not part of the serial number. The correct number "365", stamped on the left side of this piece, (known as the upper receiver), identifies it as being matched to the rest of the gun.
While the gun is of course your property and you can do with it what you wish, I also strongly recommend that you do not ruin its historical and intrinsic value by refinishing it. I can understand shooting it once or twice but I strongly advise against that, as well. If you must shoot it buy Winchester White Box, available at most Walmarts. It has the right bullet weight and cartridge pressure to function well in Lugers.
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