Strike Industries has added to its ever growing line of Glock products with its SI Rear Sight Rail Adapter for the Glock. The SI GSR is a tactical light weight, ultra sturdy, inexpensive solution for shooters wanting to add a rear sight to their Glock but don’t want to have to spend a huge sum of money to have one customized installed. It comes with a rail to mount any sight of your choice, screws to adjust height, and a back plate (Back Plate Locking System) to secure the rail and eliminate any movement from vibration. And if you choose to not use an optic, the rail has reference dots you can paint so you don’t have to remove the rail. For the competitive shooter, the rail is Mfg: Strike Industries