CZ 75B, CZ 75 SP-01, CZ 75 SP-01 Shadow alu magwell | TSBrass magwell from the Toni System production. This magwell weights 20. 6 g [0. 72 oz] and is 40 mm wide. List of compatible models is below. *Please check if your CZ does not have main spring plug with lanyard loop. If that is the case, you need to replace the main spring plug for another one such that is without the lanyard loop. Specification original Toni System product made of brass made in Italy