Paintball barrels bay be the most important part of the game.  Barrels can range in length and in bore diameter.  The whole goal is to find a specific paintball brand that matches with the bore of the barrel.  You also need to match the threads of your barrel so that they fit right into your gun and do not mess up the gun's threads.

 This barrel system is made by Empire, it contains ten pieces.  It has five backs, .685, .687, .689, .691, and .693.  The five front are lengths 12'', 14'', 16'', 18'', and 20''.  This is a professional barrel system.   

This kit is made by Evil.  They call it the Pipe.  It also has five fronts, 10'', 12'', 14'', 16'' , and 18''.  But, the five bore sizes are different..  They are .683, .686, .689, .692, and .695.  This is an intermediate barrel kit. 

This kit is made by Custom Products.  It has five backs, .682, .685, .689, .689, .693, and .696.  The fronts contained in this kit come in lengths 10'', 12'', 14'', 16'', and 18''.  This kit is used by quite a few professionals.  

This is called the Phat System and is made by A.C.I.  IT contains six backs, .680, .683, .686, .689, .692, and .695.  It only contains three fronts though, 12'', 14'', and 16''.  This is and intermediate barrel kit. 

 This barrel kit is made by OTP and is called the G3.  It contains four fronts, 10'', 12'', 14'', and 16''.  IT contains five back bore sizes, .680, .683, .686, .689 and .692.  This is a professional barrel system. 

  This barrel package is called the Scepter and is made by a company called Powerlyte.  It has 12'', 14'', and 16'' barrel tips.  It also contains .684, .686, .688, .690, and .692 barrel bores.  This is an intermediate barrel kit.

 This barrel system is made by Smart Parts and is called the Freak.  This system contains one front of your choice in length from 10'' to 18''.  But , it contains eight bore backs, .679, .682, .684, .687, .689, .691, .693, and .695.  This is a professional barrel kit. 

This system is made by Equation and they call this kit The Bizerk Pro.  It contains three fronts of 8'', 10'', and 12''.  The different bore sizes are .683, .685, .687, .689, .691, .693, this is a professional barrel kit. 

  This barrel system is made by Kapp and is called the KXS.  The only tip size 14''.  The bore sizes contained in this system are .685, .687, .689, and .691.  This is an intermediate barrel kit.

This barrel system is manufactured by Worrgames Products.  They call it the Kaner.  This barrel system comes with tip sizes 10'',12'', 14'', and comes along with bore sizes .684, .687, .689, .691.  This is a professional barrel kit.