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specifications
Stern Defense, LLC
Color:Black
Type:Complete
Platform:AR-15
- 16.1in barrel
- 15in M-LOK Free Float handguard
- Complete assembly with 9mm bolt and charging handle
- ½-36 muzzle thread pitch
- SD BU9 9mm Bolt
- Cartridge: 9mm Nato
Sd Mod 4 9mm Upper Receiver 16.1In M-LOK Complete Black
| Caliber | Manufacturer | Color | Weight | Merchant Price | Merchant URL | |
|---|---|---|---|---|---|---|
| None | Stern Defense, LLC | Black | None None | $544.45 | Brownells | Add |
Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.
A Complete Ready-to-Go Solution
The Stern Defense SD Mod 4 9mm Upper Receiver is a complete, ready to go, upper receiver solution for those looking to spend less time building and more time shooting.
The 16.1 inch, 1-10 twist, Melonited barrel, is free float in a 12in M-LOK handguard attached to a 7075-T6 forged aluminum receiver.
Included in the upper receiver is charging handle and the Stern Defense 9mm Bolt which is compatible with both Glock and Colt SMG magazines, has a Melonite finish, and is works in conjunction with the Law Tactical Folding Adapter. The Stern Defense SD Mod 4 9mm Upper Receiver is made in the U.S.A.