Is it just me, or should someone make a rear cover heavy enough that a rail could be mounted on top that wouldn't need to be re-zeroed after every shot? If that rear cover was made beefier, with a nice rail integrated on top, that would be a solution to the side mount retro (?). I'm not a fan of those side mounts. The optic needs to be closer to the shooter's eye to the rear of the receiver. A heavier rear cover, and I mean really heavier, would solve the problem of getting the optic closer to the shooter's eye. That "tin" factory cover clearly isn't going to cut it. And I have yet to see someone come up with a really stoutly built rear cover. (Yes, even the Zahal cover.)
.....?