Basic adjustment of GCMAG airgun's regulator pressure.
Basic adjustment of GCMAG air rifle's regulator using only size no. 10 and no. 12 wrenches. It would help a lot if you have a small regulator tester tube. Rotate the adjustment knob clockwise to decrease the pressure. To increase the pressure, rotate it counterclockwise. Remember: When increasing the pressure, it's okay if the plenum contains air. But when decreasing the pressure, the plenum must be empty.
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