Depends on the suppressor. Many are made to be taken apart, soaked in solvent, brushed, and reassembled.
Suppressors are legal, yes.
Yes, provided they have the proper NFA tax stamp applied to them.
Usually suppressors can be screwed on, so there should be notches to screw it on.
You can purchase silencers or SUPPRESSORS in attachments after selecting the gun I believe it is 2000 CoD points
Check your local library, gun shops, gun shows and don't forget about google and dogpile search engines.
sorry- no. Illinois law does not permit the possession of many firearms, such as full automatics, and does not permit possession of suppressors. See 720 ILCS 5/Art. 24 in the Illinois criminal code for more information. 2015 there are separate bills in both the house and senate which would legalize suppressors in IL. Call your reps and encourage them to support them.
No, you are not allowed to use suppressors in New Zealand
Yes. You have to go through the standard federal process for suppressors.
If your gun attachments are for a rail, and your paintball gun has the same size rail, then yes. Instances of this are red dot sights, flashlights, under-mounts, and lasers. Suppressors, barrels, and proprietary parts usually will not fit without modification.
You buy them from a gun dealer. In the US, that is a dealer with a special license. You would need to apply to the BATFE for transfer of the suppressor to you, and pay a $200 transfer tax.
Depends on the silencer, and the bullet. Some silencers (properly called suppressors) used a "wipe"- material that was moved aside by the bullet, and moved back to trap and slow gasses. Those suppressors could leave a marking on a bullet, especially a soft lead bullet. Few suppressors today use the wipe system, relying more on baffles and precision machining.
I assume you mean GUM, and not GUN. Chewing gum does not effectively clean your teeth.