This band allows mounting of longer barrels on 1377, 1322, 1300KT and PC77 models. It's also a much more stable upgrade for the 2289G Backpacker. It's the Crosman Custom Shop 1300KT version with an upgraded socket cap screw. It was drilled and tapped to fit the screw which is long enough to engage the full-thickness of the threaded left side. This is a lot more durable than the original screw which tends to strip the threads in the band if over-tightened or repeatedly installed. I use these on many of my own custom builds, they are very stable and fit perfect. They are made of very stiff, durable polymer that is much harder, stronger and more stable than the older Backpacker version. The cap screw fits a 9/64 hex wrench or bit which is not included.
I have two versions of this band listed. The other is in the Standard Crosman Parts category and has the original Phillips-drive screw.