I picked up an A5M XP about a month ago and the cheekpiece adjustment was different than what I expected. I expected the 2 knobs that tightened the cheek piece against the stock. The version I have squeezes the stock and tightens against 2 rails that are attached to the cheekpiece riser. At the top is a hardened nut and the red is a washer the has the same outside dimensions as the nut. They are interchangeable from side to side to allow for LH or RH, the shoulder of the tightening knob rides against the washer and squeezes the stock to secure the cheekpiece. Just wonder if anyone has used this yet and if it holds the cheekpiece tight? I haven't gotten the rifle out have to get the scope mounted etc, etc..