This is a Stevens late model 187 (with letter) inside magazine tube in .22 long rifle. It is a reproduction made exactly like the original. The brass tube alone measures 18 5/16" and 18 7/8" over the knurled tip to the end of the brass tube (not counting the follower). These are made with a steel follower for durability instead of the plastic followers they originally had.
It fits the following models: Savage 6E, 6H, 6DL, 6J, 6M, 6N, 6JDL, and 6P. Stevens 87E, 87KE, 87H, 87KH, 87J, 87M, and 87N. Springfield 187E, 187H, 188H, 187J, 187M, and 187N.
PLEASE NOTE: If your outside magazine tube measures 17 7/8" you need the tube found here as they made a few guns with a 1" short inner and outer magazine tube without modifying the model number or letter.