Replacement for paintballs.

[SgtDaemon]

anything, really, but you should definitely try it out on your own face, if after testing it on yourself you are still breathing, it's not good enough

[Ad Bot]

[eboyblue10]

Inject paintballs with liquid mercury.

everyone walked home with autism that night

[-Setro-]

if you're tired of replacing paintballs just use reballs
anyone who uses marbles or weird stuff like that is one dumb son of a bitch that deserves to be arrested
wouldn't that actually count as assault? they aren't official paintballs.

[pefu19]

nails
bugs
stickers
bucky balls

[Space1255]

Replacements:
Nails
Rocks
Mini carrots
Shattered glass
Bees
Hydrogen peroxide-injected ticks.
Wait, paintball replacements.
I was joking.

I hope the gun backfires on you

[BluetoothBoy]

bullets
they're roundish things fired from guns that make red bits on hit body parts
and they hurt a lot, too

A .50 cal to the head doesn't hurt. 

[Echoes]

you can always use HORSE

[Clear Glass]

Replace it with VX.

[Tayasaurus]

The last guy who put frozen paintballs in his gun got his arm broken and many many bruises from being beaten with a paintball gun being used as a club.

We called the guy who beat the living stuff out of him Buster. He's in jail now but it wasn't pleasant for the frozen paintball guy.

Moral of the story: Some people don't mind going to jail apparently.

[Ipquarx]

Replacements:
Mini carrots

Shoot me up the rear bb

[Cassord²]

your own semen

[warble]

Inject paintballs with liquid mercury.