Maple Leaf MrHop Bucking 50 deg for AEGs. New addition to the maple leaf hop up range. Like all Maple leaf bucking's, these give superb results. New for 2021- better performance in cold weather. MR. HOP is a hop-up bucking made of a mixture of silicone, designed for the AEG series replicas. This material tolerates low temperatures very well, without the Cold-Bore Shot effect - it does not require "warming up" to obtain a stable flight path and full range. Works great in sniper rifles. Thanks to the larger and wider surface of contact with bb provides optimal spin - ideal for heavy bbs. The rubber has an additional sealing and stabilizing ring on the inside. The barrel on which the rubber will be mounted must have a perimeter cut for this ring. Otherwise, the hop-up rubber will not fit properly to the barrel. Before buying, make sure that the hop-up rubber will fit your barrel. Fits Maple Leaf, Action Army barrels.