The Boberg XR9
Info from Boberg's website: www.bobergarms.com:
The XR9's revolutionary patent-pending design puts a full-sized barrel in an easily concealable gun, generating ~25% more muzzle energy than any other same-caliber pocket pistol in the world.
The Boberg XR (tm) feed mechanism differs from traditional feed mechanisms in that it draws the cartridge backward from the magazine. The lifting device, consisting of the lifting linkage and the ramp, imparts a kinematically balanced motion to the cartridge as it is lifted.