Talleys are aluminum , you may know this already but the rings are the same used on ultralight arms rifles ie light rifles heavy calibers means scope slippagel. I am purchasing a set of their QD's for another rifle and they are a work of art as well. To find info on Conetrol here is their address www.conetrol.com . Beauty of the Conetrol is if the front and rear reciever screws are out of alignment you can actually line up the scope in that event and put no stress on the tube because it has front and rear windage... Nice mounts and they have the strongest gripping rings I have ever seen bar none not to mention beautiful and streamlined...