In stock
Stern Defense .40 S&W Bolt Carrier Group, Phosphate | SD BU40
In stock

Stern Defense Melonite .40S&W Complete Bolt Carrier Group - SD BU40

SKU 5165491018
Brand Stern Defense
Model Number SD BU40
UPC 850001176538

Product Details


  • Manufacturer: Stern Defense
  • Caliber: .40 S&W
  • Material: 8620 AISI Steel
  • Extractor: 4140 Billet Extractor
  • Glock Cut: Yes
  • Finish: Mag-Phosphate


Made with 8620 AISI steel and boasting a Mag-Phosphate finish, the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers. It functions with Colt SMG, Glock magazines and it's fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed, including firing pin/spring/retaining pin, extractor, and extractor spring. Also included in bolt assembly is a propriety center and roll pins.


  • Made in U.S.A.
  • Constructed from 8620 AISI steel
  • Custom 4140 billet extractor providing superior ejection


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