Modify Flat Hop Up Bucking for 0.25g or Above Heavy BBs

Modify Flat Hop Up Bucking for 0.25g or Above Heavy BBs If your hop up adjustment is not having a significant effect on the hop up of your BB, your hop up packing is probably worn down It is time to change a new one. The range, precision and power can get upgraded Suitable for 0.25g or Above Heavy BBs