big country is right it does take a lighter limb for the roller gaurd i did r&d for almost 2 yrs on a roller gaurd for hca before it came on the mathews but there are more problems then gains one of the main ones if the gaurd is not in exactly the middle of the bow it will preload one limb more then the other check this out draw the bow and have a bouddy look at it he will see one limb is bent more then the other and we all know what problems this brings