SD Mod 5 9mm Upper Receiver 6in M-LOK Complete Black
$460.45 at OpticsPlanet · 3 stores
In stock Sale
Best price
$419.27at Brownells
Out of stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $419.27checked Oct 1, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $419.27 | $419.27 | $419.27 |
Since Sep 27, 2026.
About this part
The SD Mod 4 9mm Upper Receiver 4In M-LOK Complete Black is an AR-9 complete upper receiver from Stern Defense. One store lists it, Brownells at $419.27.
Fits and works with
- Caliber
- 9mm · Shop matching ammo
- Bolt
- 9mm · Bolt carrier groups
- Barrel length
- 4" · Handguards
- Handguard length
- 4" · Barrels
Specifications
- Manufacturer
- Stern Defense
- Color
- Black
- Type
- Complete
- Platform
- AR-9
- Barrel length
- 4"
From the manufacturer
Spend Less Time Building and More Time Shooting.
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 4 inch, 1-10 twist, Melonited barrel, is free float in a 4in M-LOK handguard attached to a 7075-T6 forged aluminum receiver.
On the end of the barrel mounted on the ½-36 threads is a 1.75” long, 1.2” diameter blast can designed to direct the short barreled blast away from the shooter.
- 4in barrel
- 4in M-LOK Free Float handguard
- Complete assembly with 9mm bolt and charging handle
- ½-36 muzzle thread pitch
- 1.75” long by 1.2” diameter blast can muzzle device
- SD BU9 9mm Bolt
- Cartridge: 9mm Nato
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.
Big Book Catalog, Issue:72, Page:007
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