The Carbon IC NANO Paintball Barrel Kit combines our famous ultra lightweight injected carbon back and micro ported aluminum barrel tip with four critical bore size PWR inserts: .679 / .683 / .687 / .689: all match anodized and packaged in a new lightweight foam lined zippered case. Everything you need for accurate performance with any paint in all weather conditions. Each PWR insert is finished in an ultra gloss match anodizing with lasered labeling. Each 8.5" insert is precision broached and microhoned to deliver the utmost accuracy. IC barrel back features injected long strand carbon fiber mated to aluminum threads for unmatched rigidity and weight savings.NANO aluminum barrel tip features 700+ optimized micro porting to reduce sound signature while eliminating water and debris being drawn into the bore. Includes: Carbon IC PWR Barrel Back Carbon IC PWR Nano Barrel Tip 4 Carbon IC PWR Color Matched Inserts (.679, .683, .687, & .691) Carbon Barrel Case Features: Autococker quick threads Weather resistant NANO porting Reduced sound (700+ optimized micro ports) 1.5 oz (tip only) Injected carbon back 0.9 oz (back only) Compatible with other PWR inserts ~3.3 oz (total weight with insert) 14.5" overall length 6061 aluminum co-molding Type 2 anodized Precision bore broaching Buna nitrile NBR 70 o-ring