Transformers Autobot Hop Bucking for Marui GBB ( 75 )

- Slightly narrow entrance for better sealing to achieve more consistent power output. - C-Clip to enhance lip stiffness for further sealing - Special pressure point geometry reduces inconsistency between shots for more predictable trajectory - Suitable for Marui / WE / KJ GBB Pistols, WE GBBRs and VSR-10 compatible Air Cocking Rifles NOTE: Due to special pressure point geometry, this product is optimized for use with inner barrels with open type hop up slot. ( i.e. Marui original pistol inner barrel and most compatible inner barrels ) Recommended hardness/FPS combinations: 50 degree: Up to 360 FPS 60 degree: 295-390 FPS 70 degree: 360-460 FPS 75 degree: 425-490 FPS 80 degree: 490 FPS up