ATI makes a universal cheek rest that mounts with 2 screws. It's black plastic and sells for around $10 on most of the online firearm supply sights. It really improves the cheek weld on an 817.
anyone know of a "universal" or slip-on style muzzle brake that fits the 817? I know functionality wise it wont do alot if anything for it - just like the way it looks >_< i know mossberg makes an 817 with a muzzle brake now, but as far as i have found you cant buy the brake alone