The A645 Side Mount is designed for Flat Top MSR’s and other tactical style firearms. It provides a 45° accessory platform that attaches to a Picatinny style rail. The A645 Mount can also be mounted to the rail on the hand guard to allow your back-up sight to co-witness with the sight on your R.A.M.P. Mount. This is a simple installation and requires no modification to your firearm. NEW for 2015 » To add to its already sleek design, the A645 Side Mount has been redesigned to incorporate two cut out sections to achieve an ultra-lightweight feel. The side rails have also been updated with one more additional cross slot to increase the mounting capabilities to 4 slots total.