Pretty sure that would require a class 3 tax stamp as it would be considered a short rifle.
The law enforcement version, yes. The others are readily available to the public without any restrictions.
Read the article first. You don’t have to buy all the paraphernalia that comes with it. If you were to buy the stock, yes it would be considered a short rifle.
Buy a sling and scope from Amazon instead and no stock or handle or you will be considered a badass and hit with the tax.