Luger P08 4.5mm Blowback with equipment

For sale is a very well-maintained Luger P08 4.5mm with blowback function and two magazines.

Included:
1 x spare magazine (new, tested, receipt available), approx. 4000 rounds of ammunition / approx. 70 CO2 cartridges / 1 x speedloader, 2 x cleaning kits (includes various cleaning attachments), cleaning cloths, gun oil with about 80% content, 2 x bullet traps with 50 targets, safety glasses.
Simply everything shown in the pictures.

Flaw: The gun chambers pellets into the barrel but can no longer fire them.
The reason is unknown to me; the CO2 cartridge empties after the shot.
It’s not the magazine; I ordered a new one, same problem.
The gun has been taken apart and reassembled several times—no insight gained.