I have a nice Marlin 90 in 20 gauge that for some reason I couldn't hit very well with and after patterning it and taking a good look down the barrels I can see why, they are slightly curved off to the right, looks like mostly the top barrel (they have no rib between them) what is the best way to fix this? there are no gunsmiths in my area that I would trust that I know of (Central Washington) any ideas? any good smith's here about?Thank you
Brad