Sounds like you have a legitimate gripe. I would make the store manager "aware" of your exact feelings. I would also want to put that gun thru it's paces before accepting it back (based upon their initial claim that they "ruined it"). If I could not achieve satisfaction from the store manager then I would call the next person in line (at the regional level or whatever). Customer service is what makes or breaks companies like them and hopefully someone in management is aware of that and will do the right thing. If not, I would try to cause as much trouble as possibe[:'(].

good luck--let us know
hb