AR-15/M16 Quick Release Weaver Style Cantilever Mount with Detachable Rear Ring Introducing the most Versatile Mount to the NcSTAR Line-up. 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. The Famous NcSTAR QR Lever System makes mounting the MARCQ to your flat top Lightning Fast. 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. The Rear Ring is also removable so you can set up your Red Dot Sight to Co-witness with your Iron Sights. Made of Hard Anodized Aluminum and Solid Steel, once you’re locked in this mount isn’t going anywhere!