Maple Leaf MR Hop Up Rubber Bucking for AEGs R-Hop Silicone - Optimized for winter and colder weather with its silicone material. New for 2021. Works in airsoft AEG barreled guns. Comes in a variety of different degrees. We recommend the 70 degree unless you have a specific use. The MR series buckings from Maple Leaf utilize a R-Hop style hop up system and are designed to be used with the Maple Leaf Omega Tensioner. These buckings will fit all standard AEG type barrels. No need to modify your bucking - these are already R-Hopped and ready to go!