GVAC UPPER GROUP 5.56MM 16.1" 13833 Manufacturer Model Number: 13833 Manufacturer: Gemtech Model: GVAC Caliber: 223 Rem | 5.56 NATO Type: Accessory-Uppers Item Type: Accessory Finish: Armornite Weight: 4.2 lbs. Shipping Weight: 5.1 Feature: Mid Length GVAC Gas System Feature: 15" Midwest M-LOK Handguard Feature: Gemtech ETM Flash Hider Optic Adjustable Objective: false Optic Reticle Illuminated: false