As some people have mentioned the hands are quite bad to be shot on. One of my mates got shot on his knuckles when we went back in January. Was funny for us but his hand bled lol
He got shot on his bicep and that broke the skin too as he was only in a t-shirt and the overalls. He's now got a small scar from it lol.
Watch ya ankles too. Badboy2k3 from here came with us and he pummled this guys feet under the netting he was hiding behind from about 20 meters away. Was well funny. The guy had a right jig on the go
Only other advice is don't get shot and have a great day lol
EDIT: If you want to intimidate the hell out of the oposition there is a black sliding switch that travels back and forth as you fire. Hold it back and keep the trigger down for some rapid fire antics lol. Most the time it doesnt fire but its rapid as heck and people were ducking anyway