Well wait. I've seen people be amazing with just an Uzi so a lot of the time skill does matter. But if you have a gun that rains down bullets no matter what, you'll win. Iera doesn't have that yet but just wait.

And personally I've started using the bar less, despite that the pbp was nerfed and I use it more. I feel the freeze on it really hurts it against guns like the glock and m4.

Then again a lot of people only care about guns for sparring but some care about basing. Because if you're behind a wall it doesn't matter what gun they have. But there are no walls in spar.
Also, even if you did want to give refunds I guarantee Stefan would never allow it, and there's far too many people with it to refund them all. A lot of people with the bar have quit/gone Inactive. And some people used to have it but were reset so..
Sometimes I feel the spar arena is a 1 gun room because everyone either uses glock, m4, or sten. unfortunately there really are only 3 common sparring guns. Until you learn how to use the colt6.