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Feed me more - Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver

by Joey C, Verified Owner from WI, United States Written on December 3, 2025
Review for Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver
Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver
Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver
$429.27 $419.27 Save $10.00
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Joey C's Review of Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver

Second trip out today with this upper. Has eaten everything 115gr I have fed it; on-line remans, reloads, new brass, steel & aluminum. Not as loud as I expected. I assume the blast forward device helps. Only downside so far is accuracy. My groups started opening up at 15 yds & by 25 yds were beyond 6 inches. I realize 9mm PCC’s are not tack drivers; but D@mn. ALOT OF FUN HOWEVER!
Pros:
  • FUN FACTOR A+++
  • Eats everything
Cons:
  • Accuracy is questionable
Best Used for:
  • Fun . Speed practice
Would Recommend: Yes
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