Step one: Lower the back lever to the 7o clock position as seen below.
Step two: Once the lever is in position the top part of the receiver will lift off to reveal the piston assembly.
Step three: Pull back on the charging handle and hold it in place, this will reveal the hopup unit. Make sure there is no magazine or BB’s in the gun.
Step four: Using an Allen wrench turn the middle screw that is circled in the picture above to adjust the hopup setting. Clockwise increases the hopup and Counter Clockwise decreases it. Once adjusted follow the steps backward to reassemble.