Read some FB comments from people with some experience and credibility. They think it must have been some type of pistol-caliber carbine from the sound of the shots (subsonic, no "crack"). Maybe something that took a Glock 33rd "funstick"......
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My bet is they’re FOS. Multi-directional mic’s have a hard time with that but FB-grade cell audio probably outclasses top end DoD shit anyways.