The new Fang4 features a Full Containment System (FCS) to lock your string in place. The FCS's hook-style jaw locks onto the D-loop to allow for hands-free hunting use. Alternatively, just pull the FCS back for repetitive shooting. Shoots without a sensitivity spring for the lightest possible setting, or with a medium or heavy spring (included). Independent trigger travel adjustment screw. Adjustable thumb barrel positions. Ergonomic design for comfortable use during long-held draws.