Matrix Arms 9mm Side Charge AR Upper and 9mm AR Lower Receiver - SHOT Show 2016 - Gear-Report.com
At SHOT Show 2016 Matrix Arms had an innovative AR pistol chambered in 9mm on display. It uses the popular Glock magazines, has a proprietary last round bolt hold open, and a spring assisted side mounted charging handle that does not require any modifications to the bolt carrier group.
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