Buy a decent sniper rifle (gas or spring) a scope if it doesn't come with one and then practice.
Yes. You can get replacement springs for airsoft sniper rifles.
No.
Yes, an M14 Airsoft Sniper is good. My cousin has almost all of the airsoft guns their are and he loves the M14. I would recommend it.
UTG Shadow ops airsoft sniper rifle (L96 Type 96)
Yes of course
A paintball sniper rifle can shoot father.
It depends, dose your your sniper have threds? Type airsoft sniper silencer on Google and you will get something.
A paintball sniper rifle can shoot father.
No
Define "cheap"
The one you can afford.
You must be atleast 18 to buy airsoft guns and accessories.