teal, said it use the shim that is thinner at the top ,thicker on the bottom and your cheek will be higher showing you more inclined rib,giving you a higher impact. C shim gives the most drop with the A giving the least so for a higher impact use the A shim and make sure to use the A plate for the stock bolt. Way it works on my M-1 Benelli and I think they are the same set up. The B would be inbetween raising the stock just a little. Mag Man
Last edited by Magnum_Man; 09/22/14.
