Did Browning make a double action semi-automatic pistol chambered for 9x18?
9x18 is the Makarov cartridge. Browning never made a firearm chambered for it. They did, however, make such a pistol in 9x17 - otherwise known as the .380 Automatic Colt Pistol. It was actually the Beretta 84 'Cheetah', badge engineered and marketed as the Browning BDA 380.