His style can only be described as "derivative" and he used the names of well-known characters (Butch Cassidy, Macho Callahan, Django and Sartana) and variations of titles (including numerous "Fistfuls" or "Barrelfulls") to disguise the fact that most of his efforts were routine at best.
Sartana's use of mechanical gadgets was added by director Parolini, who was a fan of the James Bond films.