The reg and the 1st stage trigger adjustment on the FX King with the GRS stock can be done by simply removing the trigger guard. (One screw.) The stock does not have to be removed from the action. Also, if the reg is changed to the Huma Gen 3 reg it can be adjusted with a 1.5 mm Allen or a standard blade screwdriver. It's just as easy to adjust as the FX AMP reg. 
