This JB3D printed adjustable butt hook/pad is designed to fit Aeron CZ Chassis

The hook can be moved up and down and the angle of the wings/extensions can be adjusted to suit your shoulder. 

The monopod can be attached either side and extends by 115mm plus 30mm fine adjustment.

Simple to fit, remove the original bolts and attach the the base plate using the bolts provided.

Straight fit onto the original stock, no drilling cutting etc needed.