I'd try to get a larger user base.

One I'd drop the ar-15 from colorado ar-15 shooters from and just make it colorado shooters.

Two I'd make a section for each type of major interest i.e.; AR-15, Pistol, Scatter gun, etc with a for sale section in each to keep everything clean.

Three I'd have a section for the various ranges to post their information and host sub-forums for their membership (for a fee of course). A place where the ranges can post meeting info, range members can discuss range issues or events etc.

Of course this is all just ramblings off the top of a newbs head.