Airmaks Krait Butt Plate Insert

The way it is from standard, it's easy to inadvertantly twist the butt plate from the vertical, and because there's no friction from the surfaces it's very difficult to tighten the bolt holding it enough to prevent it from happening. It can only twist by about 35 degrees, but it's still annoying. The insert is just a friction fit between the butt plate and the mounting rod, and prevents any rotational movement.