yup, it's a safety thing.
Without a trigger guard it's possible to fire the marker by catching the trigger on just about anything- lanyards, clothing, bloke bumping into you. Most players wouldn't make a mistake with it, but accidents happen. Just ask my poor PS2 (cleaning accident).
I know lots of players who cut their's of, I wouldn't because I'm just not careful enough.
I know it's unlikely but: Forget your barrel plug and catching an exposed trigger and causing a serious eye injury----- but think about the number of players at a tournament, then how many events each year? and it's only gotta happen once to give paintball a bad name.
Anyway, all standard markers come with one, so do all conventional fire-arms. gotta be a good reason for it.
preachy eh?
he he. We now return to our normal programming