!IMPORTANT! Compatible with Planet Eclipse S63™ Barrel Tips and PWR™ Inserts. S63™ Barrel Tip and PWR™ Insert sold separately. INSERT SIZING { "__shgImageV2Elements": { "uuid": "s-dc076bbf-fdfc-4698-b503-20cc38c747e7" } } Select bore size based on paint dimensions, desired air efficiency and weather conditions. Diameter .679 .681 .683 .685 .687 .689 .691 Length 8.5" { "__shgImageElements": { "uuid": "s-1289b345-cd29-4005-98ce-100743311068" } } More info PWR Inserts SELECT SIZE DESCRIPTION The IC S63™ Barrel Back is constructed using injected long-strand carbon fiber to minimize weight while maintaining structural rigidity. Aluminum breech threads are permanently bonded to the carbon fiber body to ensure precise marker alignment and long-term durability. Designed for use with the PWR™ Insert System, the barrel back supports consistent bore control for improved shot-to-shot consistency and efficiency. It is fully compatible with the S63™ Nano Barrel Tip and all Planet Eclipse S63™ barrel tips, allowing flexible configuration within the S63™ system. S63™ and PWR™ trademarks are owned by Planet Eclipse Ltd. FEATURES + Autococker quick threads + Compatible with other S63™ tips + Injected carbon fiber + 0.9 oz (back only) + Compatible with all PWR™ inserts + Precision bore broaching + Buna nitrile NBR 70 o-ring PRODUCT CARE !WARNING! Always use an approved barrel cover (BBD) and chronograph before play