I just got a captured gen4 recoil assembly from glockmeister in today and was expecting the end of it to have an allen key that allows you to change springs. This is not the case though as the end cap/screw is just a smooth surface. Does anyone know if this end cap is actually a screw that is threaded into the rod? Or does this assembly not come apart? There is actually no information on the Glockmeister website about this.