The crossbow is a ranged weapon, which has the same attributes as the bow in the singleplayer. The weapon is good to shoot from a roof. Cops have this item in their standard equipment.
To use the crossbow you need ammunition.
The appearance is changed by the Crime-Resourcepack.
You use the crossbow like the bow in the singleplayer.
But with a "leftclick" you can switch the ammunition-mode.
You can buy the crossbow at the weapondealer for 150$ apiece
You can't sell the bow in a shop, but you can trade it with players.
Price: 150$ / ID: 261