Will the factory Eotech with the two throw levers that comes on the Eotech and the Acog scope with the two turn screws hold a zero if you take it off and put it on? I am moving away from AR's and want to run my Eotech on my Shotgun. Sig 556, Ak 47 side rail mount etc. Does the Larue or like mount hold a zero better than the factory eotech set up? Do I need it for the primary zero holding purpose? How about for an ACOG? Do I need a mount to put between the Ak side rail mount and scope to hold a better zero?