Upgrade your marker for a variety of firing options with the external mode e-Grip. Can shoot up to 17 BPS and features 5 firing modes that can be changed on the fly, including semi auto, turbo, 3-shot safety burst, auto response and full safety auto. New weatherproof system is great for woodsball play. Internal mode system can also be set to semi-auto to meet the regulations of any organized field event. Requires 9 volt battery not included. Available for 98 Custom Pro and models with serial number 893000 and above.