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It's cool for an all-in-one 9 mm upper - Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver
by
Peter,
from MI, United States
Written on July 10, 2020
I assumed that it was a dedicated 9 mm upper that it would not have a forward assist it seems as though they used some surplus uppers 4 rifle cartridge and just built pistol caliber uppers still cool just not dedicated more like a Frankenstein
Would Recommend:
Yes
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