The recent models of Tanaka, Kokusai, Elan and HWS even make their cartridge's "bullet" portion screw separable and in silver or copper color so that they look very realistic lead / copper bullet cartridge. There are also some aftermarket cap-firing cartridges produced by Mulberry Field, B.W.C., C-Tec / Malugo and Tanio Koba for some selected compatible models of modelgun. Many of them are even designed to accommodate double or triple caps in their cartridge for enhanced blowback, sound and muzzle flash effect.