Be careful....scarring is highly possible.

i did a scene with a Mistress where She hunted a couple of us with a paintball gun. There wasn't any shooting until She cornered us. i was the first target (naked of course). She started at a range of about 10 yards. i was up against a large rock. The initial shot missed, but it hurt like hell as it was close enough for the fragments to hit me. So we decided to back up quite a bit. i don't remember exactly, but i think the 2nd shot may have been a repeat of the first (i.e. a painful miss). Ultimately, at about 20 yards, a strike was hit. It broke my skin and left a scar. The gun being used was considerably more powerful than what you'd get at a paintball range...

Bottom line is that it's better to start at a significant distance and probably a good idea to where a collar to protect your neck. i've played paintball several times - being clothed dampens the blow considerably versus bare skin.

And now i have a circle scar on my back as a reminder!