1917 DWM production.
Originally made as an Artillery Luger with a 20 cm barrel, this Luger has a new 10 cm barrel in 7.65 Para caliber.
In addition to the barrel, the rear toggle link was replaced with an Erfurt one without a serial number (to have the sights, which are absent on the Artillery version, as they are located on the barrel), and the extractor was replaced with one from a Bulgarian Luger, “пьлень”, in German “Geladen”.
Mismatching, but with original bluing.