The AUTOBOT 70° HU Bucking for GBB Pistols is a premier Hop-Up bucking designed with Tokyo Marui / KJW gas pistols and VSR-10 replicas in mind. Its 70-degree hardness is complemented by a special ring for enhanced tightness. The unique shape of the bucking improves spin stability, leading to improved accuracy. Available in blue and made of rubber, this bucking weighs 1 gram and is manufactured by Maple Leaf.