Stern Defense MOD4 Upper | 9mm | 4in | 015SD4INCHMOD4MLOK4INC

The Stern Defense MOD4 upper is a compact 9mm AR-pattern upper featuring a 4-inch Melonite-finished steel barrel and a 4-inch MOD4 M-LOK handguard. This complete upper ships with a bolt and a Glock-cut receiver face for use with Glock-cut lowers or Stern adapters. The barrel uses a 1:10″ twist, is threaded .5-36, and the charging handle is laser engraved. Made in the USA, the MOD4 is built for reliable, low-recoil 9mm performance in a compact package.

Product Specifications

• The caliber is 9mm.
• The barrel measures 4 inches.
• The rate of twist is 1:10″.
• The barrel material is steel.
• The barrel finish is Melonite.
• The muzzle is threaded .5-36 for muzzle devices or accessories.
• The package includes a complete upper assembly with a bolt.
• The handguard is a 4-inch MOD4 M-LOK design.
• The upper is supplied Glock-cut and is ready for Glock-cut lowers or use with Stern adapters.
• The charging handle is laser engraved.
• The product is Made in the USA.
• Package dimensions are 4.25 x 4.40 x 18.75 inches.
• The overall product length is 18.7500 inches.
• The UPC is 850001176200.
• Not available for direct ship to California.

With its short 4-inch barrel and M-LOK handguard, the MOD4 upper is well suited for pistol-caliber carbine competition and economical range training. The included bolt, durable Melonite finish, and Glock-cut compatibility make this upper a practical choice for shooters seeking a compact, reliable 9mm solution on an AR platform. Its combination of dimensions and features delivers a ready-to-run configuration for range use and competition applications.