Paintballs actually consist of two parts, the shell and the fill. The shell compromises the outer portion that breaks on impact, and the fill itself is the dye and solvent which make the trademark splatter on contact. The shell of paintballs is almost invariably constructed of gelatine.
The origins of the Gelatine cannot be guaranteed and cannot be predicted. Most manufacturers state that it is composed of animal Gelatine and no further information is given. It is pretty certain the animal gelatine is used in the process. The composition of paintballs is closely guarded by manufacturers and the ingredients are not shared.
What is your advice for Muslims who wish to engage in paintballing?
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh