basic shooter

It is basic one which I made 3months ago.. because present level is not different compared to 3 months ago, I upload this to show other people and receive some diagnosis of my level of designing. Please watch this clumsy product and make some comments below this text..
thank you for watching..!!

(p.s.because the program is 3D Builder, It cannot be seen your computer if your OS is not Window 9or upper one)

the 3 parts below must be assembled, and upper ones are made to show how the shooter works, and some types of gears cannot work(it is for just showing)(so, if you want to shoot something with this one, you must buy springs, gears, 1 or 2 motors, etc)