Deadlywind offers the 98 Custom/US Army owners a rear velocity adjuster that doubles as a rear stock adapter.  An RVA is a rear velocity adjuster, it allow you to adjust the velocity from the back of the gun no longer using the side factory velocity screw.  It allows you to continue using your M98 shoulder stock, strap plug, etc. (no other RVA allows this).   Allows fast mount and removal of your M98 shoulder stock (or tail/strap plug, etc.) to your Tippmann M98 marker without having to split the entire body in half!  It removes ALL "slop" between the shoulder stock and the body. Because of our unique clamping method, it is more rigid than if you had your shoulder stock mounted directly into the body.