Helix 6 Precision Carbon Fiber 18in 6mm ARC Rifle+1 Rifle Barrel 243cal 0.75GB 1-7 Twist 5/8-24 Black. Carbon fiber construction makes this Rifle Barrel from Helix 6 Precision highly accurate all while promoting improved cooling - Carbon barrels feature a high carbon/low resin ratio so that heat is transferred more efficiently which allows for quicker follow-up rounds. Helix 6 Precision 6mm ARC Hand Lapped Barrels also feature harmonic dampening which vastly reduces the amount of recoil felt by the shooter - leading to increased accuracy. These barrels are up to 50percent lighter than a steel barrel of equal contour - Which means they are the perfect upgrade for your favorite 6mm ARC rifles. The high heat resistance and superior heat dissipation of the Helix 6 6mm barrels will keep you shooting for longer without needing to break in the barrel. Buy one today Specifications for Helix 6 Precision Carbon Fiber 6mm ARC AR Rifle Barrel: Manufacturer: Helix 6 Precision Color: Black Finish: Hardcoat Anodized Fabric/Material: Stainless Steel Type 416R Carbon Fiber Caliber: 6mm ARC Barrel Length: 18 in Gas System Length: Rifle Plus Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-7 Gun Make: AR Platform Weight: 33 oz Additional Features: 33 oz Condition: New Gun Type: Rifle Projectile Caliber: .243 Caliber Features of Helix 6 Precision Carbon Fiber Barrel for 6mm ARC AR Rifle Increased Accuracy - Exceptional accuracy from Helix 6 Precisions proprietary carbon wrap process; Thermal Dissipation - Increased thermal cooling due to high carbon/low resin ratio; Lightweight - 50percent lighter than a steel barrel of equal contour; Harmonic Dampening - Unique carbon layup design dampens barrel harmonics for better accuracy; Stainless 416R rifled cores - Proven to provide the most uniform bore for match grade accuracy; Hand Lapped Bore - To reduce fowling and increase accuracy Package Contents: Helix 6 Precision Carbon Fiber 6mm ARC AR Rifle Barrel Helix 6 Precision AR-6ARC7-18R1: Carbon Fiber 18in 6mm ARC Rifle+1 Rifle Barrel 243cal 0.75GB 1-7 Twist 5/8-24 Black