This adapter works with a modified factory new style Gen 2 Kriss folding cheek rest. The older Gen 1 cheek rest has a larger hole and the adapter will not fit as snug. It requires modification of the cheek rest arm.

First step is to remove the butt stock portion by loosening the set screws. Discard that part to avoid constructive intent.

The lower receptacle needs to be cut off and filed smooth leaving only the top one.

Insert the adapter and drill for a pin.