The FORT-500 shotgun is a conventional pump-action shotgun developed by Scientific and Production Organization Fort. It has a steel receiver and plastic or wooden furniture with all versions having barrels with removable choke tubes. The same choke interface on police guns allows for installation of cup-type launchers intended to fire tear-gas grenades.
You had several variations to chose from yet you went for the ugly stockless one. Well, it does resemble the actual thing fairly well, but just doesn't appeal to me.