Recently purchased a quality (IMO) used O/U but it's choked F/F which isnt very useful for much nowdays. I want this to be an upland/recreational clays gun. Question is, should I install tubes or just get the barrels opened up? I like the idea of interchangeable chokes but something seems wrong about modernizing the gun, and the price scares me a bit. What would it cost approx. to have tubes installed vs. just reeming out the barrels? Also, if I decide to just open the chokes up, what should I open them to? Thanks.