One other comment on reinstalling the new recoil tube unit. Be careful on how far to screw the unit into the receiver. If the unit is screwed in too far, the trigger housing/fire control group will not seat when you go to reassemble the gun. The end of the trigger housing butts right up next to the back on the recoil tube. Before applying locktite, you might want to dry fit it and make sure everything goes togther as designed.