Complete 11.5-inch upper receiver with Criterion Core barrel, Combat Rail HD M-LOK handguard, and direct impingement gas system. Chrome-lined 4150 steel barrel with 1/8 twist rate.
This complete upper receiver group delivers the compact handling and maneuverability demanded by modern shooters who value both performance and practicality. Built on a proven platform, it combines quality components with thoughtful engineering.
The Criterion Core barrel is chambered in .223 Wylde, a versatile cartridge that accepts both 5.56 NATO and .223 Remington ammunition. The 11.5-inch length provides a balance between velocity and handling, while the 1/8 twist rate stabilizes a wide range of bullet weights. Chrome-lined and phosphate-coated 4150 chromium-molybdenum steel ensures durability and corrosion resistance. The barrel features M4 feedramps and a 1/2x28 threaded muzzle.
The forged 7075 T6 aluminum upper receiver is hard-coat anodized for protection and features proper T-markings. A carbine-length direct impingement gas system provides reliable operation across various shooting conditions.
The Combat Rail HD Series M-LOK handguard offers multiple mounting options for accessories while maintaining a slim profile. The A2 flash hider reduces muzzle signature and blast.
Note: This upper receiver group does not include a charging handle or bolt carrier group. These components must be purchased separately.