I just added a C-stock and a KZ quadrail. Put a Knights vertical forgrip on the bottom rail and currently waiting for te EMA shotshell holders to mount on both left and right sides of the rail. I LOVE the C-stock. The original pistolgrip stock was a bit too long for me. The KZ rail is very nice and didnt seem to add much weight. I have a Mesa Tactical 8rd shotshell carrier and rail and like it but I wish it held the shells more securely. I plan on adding an optic soon but not sure which one to get.