MANUFACTURER: Gemtech MODEL: GVAC TYPE: Accessory-Uppers ITEM GROUP: Upper Receivers CALIBER/GAUGE: 223 Rem | 5.56 NATO FINISH: Armornite FINISH TYPE: Applied Finish BARREL: 16.1" RATE-OF-TWIST: 1-in-8" THREAD PATTERN: 1/2x28 SPECIAL FEATURE: Threaded Barrel WEIGHT: 4.2 lbs. SHIPPING WEIGHT: 5.25 lbs. ADDL INFO: Mid Length GVAC Gas System ADDL INFO: 15" Midwest M-LOK Handguard ADDL INFO: Gemtech ETM Flash Hider MFG MODEL NO: 13833 UPC: 022188894615