The "SD" means it has a fake suppressor built in. This is a non functioning suppressor it is only for looks. If you decide you want to "shorten" your marker up simply twist and remove the silencer. Now you've got a super short comfortable military looking paintball marker!
Built to withstand the rigors of intense woodsball play, this realistic mil-sim mod is manufactured from glass-filled nylon and is easy to install. Comes with all the required hardware.