Hope these came out. I have a lot of time and money invested in this project. The guts consist of a systema gearbox/motor combo. I went with the best of everything. I hot glued a screw head on the left side of the gun to prevent me from using full auto. No matter what you do you can never fully quiet the motor, but I did what I could. She is more quiet then a regular AEG, but again, its still an AEG and you can hear it if you are close enough.