Aimshot's Quick Release Picatinny Rail Mount is 40mm long and has a 14mm rise mount to allow for quick removal or attach items. It is ideal for shorter optics/red dot sights or items that utilize a plastic mount for picatinny rails. This rail mount is constructed of aluminum with a black finish.New standard height quick release picatinny rail mount. 40mm long and 14mm rise mount to allow you to quickly remove or attach items to picatinny rail. Ideal for shorter optics/red dot sights that you want to raise to co-witness lower in the window, or items that utilize a plastic mount for picatinny rails as there is more room between the bottom of the rail and the base.