This pistol grip directly attaches over the pre-existing port after removing the original stock to allow the shooter to convert thier Remington 870 into a hip fired shotgun. The back end of this grip is also threaded to take on a mil-spec AR15 buffer tube letting allowing the option of installing a separate stock kit (sold separately). This model also comes with a 3-shotshell side saddle. All tooling and hardware included for installation.