So I want to get a Steiner P4Xi 1-4x24 for my AR15, but I'm not sure how much offset I need on the mount. I like to run my stock fully extended and I have a Magpul MBUS mounted on the gun (I'm willing to remove it if it's the only way I can get the proper eye relief with the stock extended). Eye relief on the Steiner is 3.5-4". Anyone know how much offset (if any) I need? I am thinking getting an ADM QD mount.