u/Careless_Pollution45

Maybe Im dumb but how are you guys securing the pistol to change the muzzle device? Cant use any reaction rods etc because of the fixed ejector or whatever it is thats sticking out inside the upper reciever bolt cavity (I could push the roll pin out but dont want to if I dont have to). Ive got most things for changing anything on an AR but the reciever lugs dont line up with them either. At a bit of a loss here.