Sights and Scopes
A gun sight or scope will only help if your gun shoots accurately and consistently. High powered scopes are nearly useless because paintball guns are not nearly as accurate as firearms and they take too long to use. Sights are typically only useful for your first few shots as they take too much effort to use during a fire fight. When I use a sight, I prefer a basic red dot sight (
compare prices) that I can turn on when I need it, though I usually will play many games without ever turning it on.
Clothing
The key to being a sniper in paintball is stealth, so choose your
clothing well. You don't necessarily need camouflage (though it often helps), but make sure your clothing will blend in with whatever your surroundings are. Army surplus and thrift stores are some great resource for some low-cost camouflage, or if you really want the best, many stores sell paintball specific camouflage. Some people also choose to wear a ghillie suit (
compare prices) which really helps you blend in with your surroundings.