Introduction
Once you have gotten to step 7 of the tear down guide you're ready to replace the chamber of the gun.
Parts
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Use your fingers to grasp the orange circle piece that's in direct contact with a small device protruding from the chamber of the gun, and slide the circle towards the trigger.
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Move the chamber slightly so that the orange piece no longer connects to the chamber.
 
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Once you have released the tan sticks, and pulled back on the orange circle, the tension should release the chamber making it easily removable.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.