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Fixed! CMMG 9mm AR15 Rotary Delayed Blowback upper on WWSD 2020 lower made reliable!

Mike (Bloke) tells of how he fixed his 300 series CMMG Resolute 16″ 9mm Para rotary delayed blowback upper on his WWSD2020 KE Arms lower to make it reliable with a stiffer ejector spring (from David Tubb).

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9×19
9x19mm
Parabellum
upper
Wechselsystem
What Would Stoner Do
PMag
P-Mag
blow back

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