At the request of the Fabrique Nationale d’Armes de Guerre, the famous inventor John Browning who may be called the Father of Automatic Pistols because it was he who conceived the first simple and perfectly reliable modes, crowned the incomparable series of his creations, bot long before his death at Herstal, with a 9mm pistol holding 13 cartridges, which meets all the requirements of the most sever specifications, as may be seen…in the manual which you can download here.
The Browning 9mm High Power Automatic Pistol is a recoil operated firearm utilizing the energy of recoil:
to unlock the firearm and open the action
to extract and eject the spent cartridge casing and
to recock the hammer