Mesa Tactical Saddle Mount with SureShell shtogun shell carrier for Remington 870/1100/11-87 (4-Shell, 12-GA, 8 1/2" Rail Length) Fits Remington 870/1100/11-87 Holds 4-Shell, 12-GA, 8 1/2" Rail Length No fitting or gunsmithing is required to install.