Tuning FX Royal

I think Hummer 57 is right. It is a very short screw. I can see an o ring under it. I will add some blue loc tite and screw it in just below flush. Thanks

If the Dreamline uses the same receiver block and barrel inlet as the Royale, you should not see an O ring under that third screw hole. My Royale has a small flat milled into the barrel inlet that is directly under the hole. The rear O ring is behind it, and if that is visible through the hole, the barrel is considerably out of battery. Again, that's assuming the same assembly as the Royale.