A powerful bolt action rifle some basic camouflage, patients, and time to sight in the rifle properly.
Airsoftgi.com
if it is spring no electric yes
Over time, yes.
I would personally buy .25 gram high impact bbs for good precision
Well, the legal FPS for an airsoft gun is 450, but you can get snipers, AEG's, etc. that run up to 600 FPS and beyond.
Well, first you would need to have the kit to be an airsoft sniper. That entails purchasing the basics of a sniper kit, such as a sniper gun, most likely a scope, and then using tactics that a sniper would employ. I do have an article that relates to this subject at my blog - http://6mmbbcom.blogspot.com/ Snipers tend to have a certain mentality about one shot - one kill vs the spray and pray attitude of some aeg players. Snipers employ tactics such as cover and concealment and being what we like to call "a sneaky basta$%" pardon the french...You can check the blog for a link to a youtube video showing 2 airsoft snipers in action. Hope this helps answer your question.
No, you do not need a licence for airsoft guns in the US.
You can try http://www.6mmbb.com/servlet/the-1027/Swiss-Arms-SA1-Airsoft/Detail or just do a search engine search for it. A gun under $100 will not be very good.
yes, you can and need a license to own an airsoft gun in nyc.
You never need a license to have an Airsoft gun.
You do not need licenses for airsoft guns, as they are not firearms.
No