I got rid of the last K4 I had a while back, but I seem to remember that one could dismantle the turret from the tube, unscrew the ocular lens, and slide the ring off?

I should think that spreading the ring open far enough to clear the turrets would put a nasty kink in them. Might actually be the best approach actually now that I think about it. Just plan on using better split rings to re-mount on the gun.