After the introduction of cartridge-firing firearms, the LeMat system appeared in pinfire, but this version is exceedingly rare. A centerfire version in 12mm Perrin or 11mm Chamelot-Delvigne, with a 24 gauge shot barrel, was made in later years in Belgium. While having better sales than its pinfire relative, the centerfire LeMat also had no real commercial success due to the invention of the double-action system. With both weapons, loading was accomplished via a loading gate located at the 4 o'clock position for the cylinder, and by swinging the breech of the shot barrel up and left.