This is a Peters Stahl multi-caliber system based on the 1911 design. It includes .22, 9mm, and .45 ACP.
Peter's Stahl made the uppper receiver and barrels for the Springfield Armory Omega system.
Price includes Pelican case, PS07 in .45 ACP, 9mm barrel, .22 cal upper receiver magizines and a complete set of repair parts.
Peter's Stahl website (german) is at:
click on pistolen then wechselsysteme for info.