Put some bolt guns in. A Remington 700 or M40A1/A3 is a common one, so maybe something less known like the Ruger M77 or the Winchester Model 70 could be in it.
While this isn't super likely, adding .22 rifles like Ruger 10/22s or some .22 bolt action would be an interesting change. You'd be amazed how effective a .22 round can be. A .22 Magnum round is highly underrated, if you ever have a chance to buy an 8 or 9-shot .22 Magnum snub, do it. Those guns are very effective.
Put some older guns in, Single Action Armys, whatever.
A Springfield XD still has yet to shine in the gaming world....
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