There are a number of ways to display fire arms from the typical wall rack to elaborate custom stands.
Art Display Essentials has clear acrylic table top stands for rifles that are sold separately in three sizes to accommodate different size fire arms. Typically a shorter one will be at the stock and the taller one will be at the forestock. By using these combinations you can also get a tiered effect with two rifles. These can be seen here: http://www.artdisplay.com/gun-stands.html
H-ArmsAnother option that has a refined look is to use one of Art Display Essentials H-arms. You can bend the H shaped armature to hold your pistol or revolver the way you want. You can float it off of the base or have the handle sit on the base.
This same H-arm is also used for mounting powder horns and other items of that nature.