AR-15 SD Mod 4 9mm Upper Receiver M-LOK Complete - SD Mod 4 9mm Upper Receiver 16.1in M-LOK Complete Black
2 options
- 4"out of stock
- 16.1", this page
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Stern Defense
Overview
The Stern Defense SD Mod 4 9mm Upper Receiver is a complete upper designed specifically for the AR-9 platform, providing a seamless integration with your lower receiver. With a caliber of 9mm, this upper is ideal for those looking to build a compact and reliable firearm that excels in both performance and versatility. This product is commonly found in builds focused on tactical applications and competitive shooting, where the 9mm caliber offers manageable recoil and enhanced accuracy.
Specifications
AR-15 SD Mod 4 9mm Upper Receiver M-LOK Complete - SD Mod 4 9mm Upper Receiver 16.1in M-LOK Complete Black
2 options
- 4"out of stock
- 16.1", this page
Available Merchants(1)
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Stock Alert
Price and stock
The Stern Defense AR-15 SD Mod 4 9mm Upper Receiver M-LOK Complete - SD Mod 4 9mm Upper Receiver 16.1in M-LOK Complete Black was out of stock everywhere we track for all of September 2026, and today the one retailer we track is out of stock. Listed prices start at $544.45 at Brownells for when it comes back.
Prices checked · refreshed daily across 37 retailers
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