When you say interference fit of the barrels, how much? My V grade barrels remove rather easily once the button is pushed.
This might seem academic, but, first be sure you have a V grade Darne-some of the R clones and all of the Charlins have a push button to remove the barrels.
That said, Geo is correct-they should require a tap to be taken down. If you push the button and they fall out of the slot, something is amiss.
My bet would be some crud is preventing them from fully seating. Kirk Merrington would be your man, a Darne really isn't an amateur gunsmithing project.
Best,
Ted
