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Ar-9 build - Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

by Pete P., Verified Owner from SD, United States Written on November 25, 2025
Review for Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver
Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver
Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver
$185.99 $129.99 Save 30%
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Pete P.'s Review of Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

I had an AR-9 upper and wanted to finish my build (for an M&P type). I had no issues with this dropping in and cycling with the PSA upper, the Anderson lower wearing a Stern magwell adapter.
Pros:
  • Solid well built
  • Cost & availability
Cons:
  • None
Would Recommend: Yes
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