Accessing the Maxim 9's inner barrel and hop-up unit requires significant disassembly of the pistol. Only attempt if you have the necessary skills and tools to do so. Attempt at your own risk.
- Small hammer / mallet
- Universal pistol block / bench block
- 1/8" roll pin punch
- 3/32" roll pin punch
- 3/32" punch
- Phillips #1 driver
Begin by removing the magazine, then follow the instructions in your owner's manual to remove the slide.
Remove the large roll pin with a 1/8" roll pin punch.
Pivot the grip downward.
Slide the grip off the rear of the frame. Be careful not to lose the knocker lock spring (indicated with arrow), which may become dislodged when removing the grip. You can cover the area with a rag as you remove the grip to help capture the spring. Remove and set aside the knocker lock and spring.
Using a 3/32" roll pin punch, remove the forward roll pin.
Using a Phillips #1 driver, remove the screw securing the trigger lever spring. Unhook the spring from the trigger lever, then set the screw and spring aside.
Using a 3/32" roll pin punch, remove the roll pin that is now accessible.
Set the hammer housing aside.
Using a 3/32" punch, remove the pin securing the hop-up and inner barrel assembly to the body.
When sliding out the hop-up and inner barrel assembly, take care as there may be a small spring installed in the right side of the hop-up unit. Place your hand or a rag over the hop-up as you slide it out.
Using a Phillips #1 driver, remove the two screws to disassemble the hop-up unit.