Heckler & Koch interchangeable system Custom Sport, cal. 9mm Luger, for USP grips cal. 40 S&W including 2 magazines

Heckler & Koch conversion system Custom Sport, caliber 9mm Luger, for USP grips caliber 40 S&W including 2 magazines
The conversion system consists of slide, bolt, and the pistol barrel.

The conversion is simple:
Disassemble your weapon and replace the barrel and the complete bolt with a new caliber.
Features:

9mm conversion system with bolt
Conversion systems for semi-automatic pistols
including 2 magazines