I have a Command Arms SRS stock and I'm having cycling issues. It attaches to my Rifle buffer tube. The problem I'm having is that the rifle length buffer and spring I have on it don't let the bolt travel far enough to provide the necessary inertia to strip and chamber the next round. I have tried replacing the Rifle length buffer with a carbine buffer while leaving the rifle length spring and the rifle cycles just fine. however I don't believe this is the fix since I'm running a 20" barrel. I've already tried shortening the screw that holds the stock on the tube and it helped the buffer travel further back but not enough. Any help would be appreciated. Thanks Guys