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The way this article is written is somewhat confusing.

The .380 uses a bullet diameter of .355"

The 9mm makarow bullet is .364" diameter

The 9mm makarov case is approx 1mm longer than the .380 as it is a copy of the german 9mm ultra cartridge, which used the .355" bullet

Because the 9mm Markov ammunition is more difficult to get than .380 ammo, there have been replacement barrels available for some time. No gunsmithing is required. Just strip down the gun like you were cleaning it and reassemble with the new barrel.

It is somewhat similar to the Russian 7.62 Nagant revolver. Since the ammunition is difficult and expensive for that, there are replacement cylinders available for them in .32ACP. There are also special dies available to use the existing cylinder, but to reform the brass from 32-20 brass (it is a little short, but works).

And no, I don't have one if any gubbiment agents are out there. However, I have formed several different types of brass that is no longer available from readily available brass.