I have a membership ship so haven't rented a gun. Look at their website. It has a calendar of events. They should be open. I think they're only closed one day a year and that is for a youth shoot.
Give them a call. This webpage isn't necessarily monitored by employees.
Non members can't use the ranges on Monday or Tuesday, but I've never tried to rent a firearm. If you're looking to use shotgun I know that you can on JBER if you have access. However, your best bet is to look at the website or call directly if you have any questions. You can get a cheap rifle, shotgun, or handgun, for about the same cost as a yearly membership that would be better than a rental regardless.
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