If you just bought the gun there is really no need to buy new internal parts.
No, you do not need a licence for airsoft guns in the US.
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
tell him you need a airsoft gun because you are joining the army next year and you need the practice
If you were an Engineer for a company that would be the closest thing. Airsoft guns generally don't need testing, like actual firearms, and any testing would be done in the company, not publicly.
No, I dont think you would need to have a licence for buying a airsoft gun but it may vary in what state you live in. I buy all my airsoft guns from budk.com
You need to specify upgrade WHAT.
Unless it is electric.
yes
Yes. All you need to do is take disassemble your airsoft, take out the spring, and buy a newer, better one. I reccomend all airsoft at Evike.com.