How about the gunsmith have a gun range where ammo is unlimited and you test abilities of your weapons on targets at varying distances, because its in the tower damage is nullified on other players and people can figure out what works best for them by hitting targets, could even develop a point system to show which guns work best. +1 if you like
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It would be cool to test a weapon that you are thinking about buying at the tower. You could go up to the vendor and click and option for "test" and then you could go to the range with the fully upgraded version with the ballistics and stuff being changeable. It would also be cool if they shot tracer rounds just to see where the bullets go. This would be very nice for Xur's exotics.