Description: KWA A.E.G. High Performance 2G Hop Up Bucking for KM4 / KG36c Series Specifications: Introducing the new High Performance 2G Hop-Up Bucking designed to enhance the overall performance of the KWA hop-up unit. When correctly installed, the High Performance 2G bucking will increase the accuracy, distance, and consistency of the rifle. The special formulated material enables normal operations in cold temperatures. KWA does not warrant or guarantee compatibility when the High Performance 2G Hop-Up Bucking is used/installed in products other than KWA.