This is the complete inner magazine tube Remington model 12 pump .22 S, L, LR. It fits the Remington model 12 12c with a octagon barrel. The tube is complete with follower, spring and plug (with spring and lever in Forearm plug) Tube length from Forearm of plug to Forearm of steel tube (not including follower length) is 16 3/4 inches. It is ready to be installed!