In Stock
Ar-15 Sd Mod 4 9mm Upper Receiver 4in M-Lok Complete - Sd Mod 4 9mm Upper Receiver 4in M-Lok Complete Black
Sold byBrownells•Posted Apr 28, 2026
Compare prices for Stern Defense AR-15 SD 4 MOD4 Complete Upper Receiver 9mm Luger 4" M-LOK$419.27
Price and stock data refresh continuously from Brownells.
Deal Summary
- Currently in stock.
- Caliber: 9mm
- Category: accessory
- UPC: 850001176200
- SKU: 100033499
- Brand: Stern Defense
Price History
Deal Details
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 A 1/2-36 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 h
Other Offers for This Product
Active offers from your catalog for Stern Defense AR-15 SD 4 MOD4 Complete Upper Receiver 9mm Luger 4" M-LOK.
Comparing 4 retailers carrying this product
Lowest Price: $345.96
Highest Price: $443.48
You Save: $97.52
Avg Discount: 5% off
STERN DEFENSE MOD5 UPPER 9MM 4IN BBL MLOK RAIL
Stern DefenseBattleHawk ArmorySKU/UPC: 850001176200
$345.96$429.27Save 19%
View at BattleHawk Armory
Stern Defense 9mm Upper 4in Melonite Barrel 1 to 10 Twist MLOK AR15 PCC
Stern DefenseShooting SurplusSKU/UPC: S76200
$401.84
View at Shooting SurplusAr-15 Sd Mod 4 9mm Upper Receiver 4in M-Lok Complete - Sd Mod 4 9mm Upper Receiver 4in M-Lok Complete Black
Stern DefenseBrownellsSKU/UPC: 100033499
$419.27
View at Brownells
Stern Defense AR-15 SD 4 MOD4 Complete Upper Receiver 9mm Luger 4" M-LOK
Stern DefenseMidwayUSASKU/UPC: 897799
$443.48
View at MidwayUSA