[mrerick]

in the first of your latest group of pictures, you can see the flat at the front of the frame where the serial number normally appears. It looks like it gently curves inward in a concave shape. This is where the frame's serial number would have been removed. The work is very skilled and probably required a precision mill.

You can also see other surfaces that are normally squared and level are now proud to adjacent parts or dished or curved. These are also evidence of removing markings.

Normally there is a small "L" shaped sprind under the take down lever that fits in a groove to keep it in place while firing. This appears to be missing, but may not be accommodated by a replacement lever made differently than the original.

If I have not recommended it, take a look at our FAQ document. It's pretty useful.

And, If I were you, I'd submit it to the ATF process and make it legal again.

It's one of the more interesting modified Lugers I've seen.