“An extended mag tube is only practical on a long-barreled shotgun. They claim their objective is to ban tactical shotguns. Why would anyone choose a long-barreled shotgun as a tactical weapon? “
A 24-26” barrel isn’t that unwieldy. The mere fact that one can be screwed on virtually any pump gun or autoloader is all these dirt bags need for an excuse to ban them.
Five 3" shells is 15", and then you have to allow for the spring.
I'd think a 24" barrel would support at most a 6 round magazine. After that you have to start lengthing the barrel in 3" increments for every additional round.