The Morgan Premium Recoil Pad uses CNC Machined aluminum mounting plates.  The #15M has the standard Straight (flat) shoulder pad that provides a comfortable surface on the shooter's shoulder.  The new Mega Butt Plate measures 2 inches wide by 5 1/2 inches long, has straight sides, and is meant to be trimmed to match the stock by the installer.  Mounting holes must be drilled in the butt plate where appropriate for your stock.  The recoil pad adjusts up and down (11/16 inch rise, 13/16 inch drop).  By adjusting the amount of squeeze on the recoil absorbing sponge rubber, the feel of the pad can be changed (harder/softer).  All Morgan recoil pads will add about 1 1/4 inches to the length of the stock, and include instructions on mounting and adjustments.  Morgan recoil pads do not rotate or move sideways.