One side of the adapter is recessed to allow the filling probe to seat fully.

Please check your fill port orientation, this is made for a more or less horizontal fit as pictured, any other may need the mount removing to fill the gun.

Easy fitment:

-Simply loosen the single bolt for the barrel band and remove it.

-Place the barrel band inside in the grove on the rail adapters front side -some light pressure may be needed.

-Slide the new adapter and barrel band back onto the barrel/air tank evenly.

-Retighten the bolt for the barrel band