Awesome i see the diagram now. I appreciate the drawing.
If MCU is referring to the arduino board; I want an MCU so that I can program the solenoid to do 3 shot burst, 6 shot burst and full auto. As it is now with the mechanical trigger it can only do semi auto.
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Bob.
Ok I have all the parts I think I need. Only thing that I am confused about is the 12v-5v converter in Cherk’s drawing. Do I need it? Or can I hook up my power source to the VIN pin on the Nano board?
What pins do I hook up the parts to? There is a push button switch that will be separate from the nano board. I want the push button switch to control the solenoid.
Also do I have the correct diode? It is a 4004.
*I don’t if this matters but, the Batteries that I’m currently using are different than the batteries I originally listed. The ones I’m using now are standard 4 AA (1.5v). But the permanent batteries will be 3 (3.7v) and 1 (1.5v)
Description of what I want the electronic mechanism to do:
IMG_2073.pdf (878 KB)
Should I use arduino to control a transistor Tip120 instead of an expensive relay and relay board?
You could use a transistor and save some money. With that, you could also power the board and solenoid from one power supply. Although you'll likely need a capacitor as well to make sure your board doesn't shut off while the solenoid pulls.
A TIP120 is an extremely poor choice of transistor. 
A logic-level FET would be far more appropriate. Not sure what your definition of "expensive" is, but the relay boards are just a few dollars on Aliexpress. However a FET module would be a much better choice.
You have many blogs and basic projects with a clear explanation in the Arduino blog. Try to work on those grasp the content and increase your level of knowledge in the field of electronics and various components
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