Cu – based bulk metallic glasses (BMGs) exhibit interesting mechanical properties since they combine high fracture stress, significant fracture toughness and good corrosion resistance. Quaternary systems with general composition Cu-Zr-Ag-Ti show wide composition ranges in which BMG can be obtain. The aim of this work was to study the influence of silver content on the glass forming ability and on the mechanical properties of the Cu-Zr-Ag-Ti alloys. Multicomponent Cu – based alloys were produced by casting technique into a copper mould, manufacturing rod shape samples with maximum diameter of 3 mm. Structural characterizations were studied by x-ray diffraction. Calorimetric measurements were performed in order to check the stability of the amorphous phase, the presence of a glass transition temperature and the crystallization behavior. Mechanical properties of the investigated alloys were determined by means of Vickers microhardness and room temperature compression tests.