What Kind of Gun would be most important to get next?

If this isn't the place to post this question let me know and I'll take it down or rephrase!

I'm working on getting guns for both use and fun. I've so far got an AR-15, Glock 19, and Benelli M4. I'm trying to get a large variety for different uses or situations. What would be the next best style of firearm to get? I'm not looking for a super long range rifle. But would something like an AR pistol or .300 blackout be good to look at? Or something more uncommon?

submitted by /u/Fallout_Lord
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