Maple Leaf Decepticons Hop Up Rubber Bucking for VSR/GBB. Works in airsoft VSR-10 rifles and WE/Marui/KJW gas guns - pretty much all airsoft gas guns. Comes in a variety of different degrees. We recommend the 70 degree unless you have a specific use. The Decepticon series buckings from Maple Leaf utilize a concave hop up system and are designed to be used with the Maple Leaf Omega Tensioner. These buckings will fit GBB (WE/TM compatible) and VSR cut barrels (bridgeless). Specifications - Brand: Maple Leaf - Material: Rubber - Compatibility: Compatible with Marui / WE / KJ GBB Pistols, WE GBBRs and VSR-10 compatible Air Cocking Rifles. - Package Includes: 1 X Rubber Bucking Features - Made with rubber to tightly seal in position for increased velocity over a standard bucking - Narrow entrance for improved sealing resulting in more consistent power output - Hop-up performance and accuracy increased through pressure point geometry - C-Clip to enhance lip stiffness for further sealing - Compatible with Marui / WE / KJ GBB Pistols, WE GBBRs and VSR-10 sniper rifles - Compatible with old style WE Tech gas blowback pistol or rifles - Degree recommendations: - 50 degree up to 360 FPS - 60 degree 290-390 FPS - 70 degree 355-460 FPS  - 75 degree 420-490 FPS - 80 degree 480 FPS or higher