Is there a "best" way to keep my 1" scope from moving in 26mm rings. I put friction electrical tape on the top and bottom ring halves front and rear. It seams to have halted the forward migration, but the scope is still rotating in the rings under recoil. The rings are for claw mounts on an 8mm Brno and the scope is a Leupold 1.5-5. Thanks for looking.

I know better than to say: (Buy some 1 inch rings) It's probably a proprietary system.

It's best left to a gun plumber. The fix is to soft solder .015 inch brass shim stock into the ring halves and then lap them out to one inch. The lapping will chew out the sides faster than the top and bottom which will give the rings the added compression you will probably need. I have done a dozen or so over the years. If it's done properly it's practically invisible. The brass can be colored with a Bavarian bluing pencil. (Felt pen)

From memory about 5 wraps of clear cellotape (not the opaque stuff you get nowadays) and cut the tape off the roll so it doesn't overlap the start i.e. an even 5 wraps. May need more but you'll have enough when the scope will snug down into the bottom half of the rings. Once the rings are all tightened up the cellotape hardens up to a solid none slip plastic that doesn't soften in heat and is unaffected by water etc.

Done quite a few this way in earlier times when rings were not always easy to get for some applications. I don't like electrical tape or any other of those plastic type tapes as they soften in heat and can still slip.
Clear cellotape does not and if you get some the width of the rings it is invisible.

...or, perhaps you could sacrifice a couple of fingers from some rubber gloves. IIRC Buehler mounts made for Weatherby used rubber inserts to stop the scopes moving. They may not last forever but you might have cheap fun while they do.

Black plastic electrical tape works fine and is forever. I have one scope mount that was bushed with electrical tape over 50 years ago and is still zeroed exactly as it should be.

Cellophane tape is made from organic materials which degrade with time. In fact, it's chemically only a couple of steps away from gunpowder. That's why old reels of movie film get brittle and even catch fire.

I do what Speer suggested, but instead epoxy the shims in place then lap the rings. Use 24hr epoxy for more strength. Brass is easier to lap, but stainless shim stock will work as well.

Jeremy

quote:

Originally posted by Stonecreek:
Black plastic electrical tape works fine and is forever. I have one scope mount that was bushed with electrical tape over 50 years ago and is still zeroed exactly as it should be.

Cellophane tape is made from organic materials which degrade with time. In fact, it's chemically only a couple of steps away from gunpowder. That's why old reels of movie film get brittle and even catch fire.

True but probably the degradation occurs when exposed to air. Once clamped in rings it seems to last. I've had scopes mounted for years and when eventually the scope is taken from the rings the cellotape is still good, not to peal off and use again but a good hard plastic.
Nothing like having an extra bit of gunpowder along on a hunt

.012 aluminum, brass or mild steel shim

It realy is that simple