myax's rules are right, but there are also more rules depending on the map.
crossroad's: have to stay inside market place. player's must stay on "their side" of the bomb, as a terrorist you would have the arches leading to the terrorist base behind you. vice versa for seal's. no going ontop of any of the surounding building's.
frostfire: usually played in the warehouse/box room. since there is no bomb, middle boundry is the crooked box on the right for terrorist's, left for seal's. someone usually point's the box out in-game before the first round start's.
requim: played underground down in the casket room where the bomb is. casket's are used as cover. player's cannot pass bomb, same as in crossroad's.
almost any map can be played paintball, those are 3 of the most common.
they all have the sub machine gun's on single only rule. and the no nade's smoke's or flashbang's rule.
sub machine gun's(SMG's) are:
for seal's:
HK5
HK5 SD (usually not allowed in paintball)
HK5K
for terrorist's:
9MM Sub
F90
so, if you use anything besides that it is against the rule's.
the host will usually explain the rule's before the game start's too, so just listen
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