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Will this upper work with a regular mil spec lower? I want to use the EndoMag with my PCC. — 1 Answer

by Stephen L, from CA, United States Asked on December 3, 2019

Name FM Products Foxtrot Mike FM-9 Monolithic 9mm Upper Receiver (4.4)
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Answered by Aj, guest, from MA, United States, on December 16, 2019

I have the 10.5 inch upper on a standard ar 15 lower using the endo mag. It runs okay but I've had issues. Not sure if its mag or buffer related. Issues are mostly failure to feed or eject correctly. Some tuning should fix these quirks. I think the upper is good to go! Side charging handle on mine folds and feels flimsy, although no issues yet!

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