Just got a new cm.028 AK.
When I turn off the hop up, the gun is shooting well with around 315fps without any problem. However, when I turn on the hop up, the FPS drop very significantly. I think 260 fps when half of hop turned on and 220 fps when the hopup is fully on. Is it normal to CYMA AK? Is there any way to solve this problem (like upgrading the bucking)? Thanks!