CMMG MK57 Fired Case Growth #shorts #fiveseven #57x28mm

Fired Subsonic 62gr FMJ from the CMMG MK57 utilizing the Radially Delayed Blowback. These will resize just fine.
Useful Links: https://linktr.ee/BuffRange

* * The information presented in these videos is technical and educational in nature. All safety precautions are followed. Imitation or the use of anything demonstrated in my videos is done AT YOUR OWN RISK. This video is not an attempt to sell you a good or service. I am not a gun shop and DO NOT sell or deal in firearms. Such a practice is heavily regulated and subject to applicable laws. I DO NOT sell parts, magazines, or firearms.
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