I honestly don't think that's going to be a long-term solution. I have never seen a rail-mounted optic shift just from letting the bolt slam home! Moving the carry handle back will keep it from moving when the bolt returns, but what happens on recoil? The gun moves back under the carry handle. Since the crossbolt is back against the rear of the crosscut, the carry handle will move forward until the crossbolt hits the front of the crosscut. When the bolt goes home again, the carry handle will slide backwards again. Back and forth, back and forth, [i]every[/i] time you fire the gun.
You might expect the optic to move during recoil, which is why you should position any cross-bolts or recoil lugs against the [b]front[/b] of the crosscuts in the rail. It should definitely [i]not[/i] move just from charging the rifle.