Do you have to have a gun or are they placed through the map

On very rare occasions, there will be an event like Battle Royale where springer airsoft guns are placed around the field. But, for the vast majority of the other events, everyone brings their own airsoft guns, or they can be rented: HarrisAirsoft.com/shop

You have to bring your own gun

You have to have one, they also rent guns for about $10 I believe