Anyone using a pistol caliber AR?

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I'm down here in the straight-wall area of PA. I want to start predator hunting at night and I'm trying to figure out the best rig for that task. It needs to be straight-wall. I want it to be an AR platform with a thermal, and suppressed. 350 Legend has too much power, rimfires are too limited for my needs. Someone on another forum suggested a pistol caliber AR. I have a 10mm pistol, having a 10mm AR might be perfect. Or maybe a 40 S&W to better suppress. Does anyone have any insight? I'd love to hear from you.