Introducing the most Versatile Mount to the NcSTAR Line-up.e This Single Accessory will allow you to mount virtually any rifle scope of red dot sight to your rifle in a number of different configurations.e The Famous NcSTAR QR Lever System makes mounting the MARCQ to your flat top Lightning Fast.e The Rings are 30mm with 1 inch inserts, and the Rear Ring rides on a dovetail so you can adjust the spacing for customized fit.e The Rear Ring is also removable so you can set up your Red Dot Sight to Co-witness with your Iron Sights.e Made of Hard Anodized Aluminum and Solid Steel, once youere locked in this mount isnet going anywhere!