you should either use a dry lubricant like graphite or a 100% silicone. anything else will make the plastic deteriorate.
It depends, dose your your sniper have threds? Type airsoft sniper silencer on Google and you will get something.
Deff a sniper rifle
Yes. You can get replacement springs for airsoft sniper rifles.
I wouldn't
Airsoft GI www.airsoftgi.com
No.
you will never go wrong if you buy the best you can afford
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.
go for the m14, unless its cheap looking.