TopArsenal custom MP-661K Blackbird Drozd adjustable upgraded electronic circuit board. This board allows to adjust round per minute (shots per minute) RPM parameter of your Blackbird or Bumblebee BB gun.
This board allows to adjust speed velocity in the followng range: 600-900-1200 RPM.
Please note: You may not drill the hole and use the third button (memory cells) if you don't want to.
First button from the left increases ball velocity impulse by 0.05 miliseconds. Holding it increases impulse continuously.
Second button decreases ball velocity impulse by 0.05 miliseconds. Holding it decreases impulse continuously.
Third button switches between three power memory cells, which allow to store three modes of power.
Fourth button adjusts round per minute parameter. Holding it feed balls from the hopper loader.
LED colour indicated memory cell chosen: blue, green, red. Blue memory cell always indicates when turned on.
Power legs should be taken from standard board. Wires should be soldered in front of the big capacitor.
Maintain polarity when connecting the wires! It matters!
Using this board will enhance potential of your MP-661K BB gun and will just give a lot of fun!
Made in Izhevsk, Russia where Makarov and MP-661K are produced.