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!