I recently built a 9mm AR pistol and took it out to the range for testing. In this run, I wanted to see how 115gr supersonic ammunition would feed from a Glock extended magazine. I captured this footage to analyze the bolt travel, brass ejection, and other details in slow motion.
Thankfully, it all ran well and I didn’t experience a single malfunction in the 200 rounds fired that day.
UPPER: Foxtrot Mike FM-9 8.5” with forward charger
LOWER: Matrix Arms MA9GL with LRBHO, completed using Aero Precision EPC lower parts kit and FCG kit
BUFFER: Angstadt Arms 5.4 oz with spacer and standard carbine spring (total reciprocating mass of 19.8 oz, including 14.4 oz FM-9 BCG)
OPTIC: Primary Arms SLx 1x MicroPrism with ACSS Gemini 9mm reticle
LIGHT: Streamlight ProTac Rail Mount 1
AMMUNITION: Federal 115gr FMJ (WM5199) @ 1125 fps
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