The most popular paintball guns used by pros in the tournaments are the Tippmann A-5 and the Tippmann 98 Custom. Both the guns are excellent and perform well in any weather conditions. The A-5 can be used in both Metal and ABS Barrels and the 98 Custom has a special Action Trigger and an Action Pivot. These two guns are very popular and widely used by the paintball players in the tournaments.