Mauser C96 Anics Skif A3000 H and k VP-70 Beretta M93r which one from these handguns does not come with the option of a stock?

The Mauser, H&K, and Beretta all have optional shoulder stocks. The A 3000 is known only to me as an air pistol, as such is not a firearm. NOTE- in the US, Federal law may sharply limit attaching a shoulder stock to a handgun- AND some of those handguns must be registered as machineguns.