Maple Leaf Decepticons Hop-Up Bucking for VSR & GBB Pistols 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