The adjustable butt pad is found mostly on target rifles like the FTP900 and Daystate Griffins. It is located at the back of the rifle and it is where the rifle contacts with your shoulder. There are two sorts of adjustable pad, there is the basic pad which just moves up and down. This is mainly for shooters who like to rest the butt of the rifle on the ground and it enables them to raise the rifle up higher and then with an extending cheek piece, you can rest the rifle on the ground and still have your cheek on the cheek piece and have your eye central with the scope. The second form of adjustable butt pad is the type with the paddles attached. These also move up and down, but you can also adjust the paddles to enable you to fit the stock deep into your shoulder.