Stern Defense Mod5 Complete Upper Features The Stern Defense Mod5 Complete Upper is built around an 8.5 inch 9mm barrel finished in black Melonite over chrome moly steel a combination that resists corrosion and wear while standing up to the heat generated by sustained firing. The barrel carries a 1 in 10 inch twist rate matched to perform reliably across common 9mm bullet weights used in AR pattern pistols and carbines. The upper receiver itself is machined from aluminum and finished in anodize assembled complete with a dust cover and forward assist for a fully functional ready to install unit. Threaded for .5-36 and shipped with the SD HBC 9mm blast can the barrel setup helps manage the increased muzzle blast that comes with a shorter 9mm barrel. A 10 inch Mod 5 M-LOK handguard gives builders a full length rail surface for mounting lights optics foregrips or other accessories needed for a defensive or range ready configuration. The upper includes the SD BU9 Glock cut bolt making it ready to run with Glock cut lowers or with Stern Defense s own lower adapters for other platforms. An SD CH1 enhanced charging handle improves manipulation during malfunction clearance or administrative loading. Laser engraved and made in the USA the Stern Defense Mod5 upper gives builders a complete drop in 9mm upper solution without needing to source and assemble individual components. Stern Defense Mod5 Complete Upper Specifications Manufacturer: Stern Defense Model: Mod5 Complete Upper Caliber: 9mm Barrel Length: 8.50 Barrel Material: Chrome Moly Steel Barrel Finish: Black Melonite Twist Rate: 1:10 Receiver Material: Aluminum Receiver Finish: Anodized Handguard: 10 M-LOK Includes: SD HBC 9mm Blast Can Bolt Charging Handle Available At: GrabAGun