This is a complete inner magazine tube Remington model 12A pump .22 S, L, LR. It fits the Remington model 12A with a round barrel. The tube is complete with the follower, spring, and plug (with spring and lever in Forearm plug) Tube length from Forearm of plug to Forearm of brass tube (not including follower length) is 14 1/4 inches. It is ready to be installed!