Tactical Picatinny Riser Mount Rails Dual 90 and 45 degree Quick Release Detach 13-Slot Medium Profile for Red Dot Scope Optics RISER MOUNT. Medium profile riser mount rail is good for red dot sight clearance over front sights. With extra height you dont remove the front iron sights. 90& 45 DEGREE COMBO. Dual picatinny rails are designed for simultaneous use of the iron sights. QUICK RELEASE. Its very easy and quick to finish installation and removal. 13 SLOTS PICATINNY RAIL. The well machined rail gives you an additional option for a secondary optic feature. PRACTICAL MOUNT RAIL. Double rails mount is perfect for red dot sight, rifle scope optics.