A member here of GT, Max100, made a post back in November 09, that he makes and sells +3 ext tubes for the 870 shotgun. I sent him a few e-mails and a few PM's, and I finally got in touch with him. Here it is, my new +3 ext tube. I really like it. Now I have a 7+1 870. It is with in a "hairs width" of being identical in length to the factory tube, only with no "crimp" in it. $65 Delivered. It came with a follower and a new spring. Before After Side-by-side Wanna kill these ads? We can help!