[mapsjanhere]

There is one peculiarity with German gun laws, smaller caliber exchangeable barrels don't count against your (limited) guns you can own. So it's quite popular to order extra slides and barrel combinations to match an existing frame. At some point the original 45 slide became separated from the 10 mm slide, or, maybe after it was imported to the US, the owner took advantage of the more liberal gun laws to obtain a second frame and make a second pistol out of it. As on how it ended up in the US, importing your own guns is not much more difficult than doing any regular FFL transfer, you just need to find a suitably licensed FFL to handle the paperwork.