The iFIT Bore Kit is an excellent and highly recommended product from TechT. This product makes paintball bore sizing possible again! Substantial accuracy and efficiency can be added to a paintball marker by obtaining the correct paint to barrel size match. No other manufacturers offer as many bore sizes as the iFIT as the sizes range from .692 down to .667. This product will offer you the most comprehensive selection of bore sizes and threads to date and is the most economical option. Not only is this one of the best and most accurate barrels, but it is also a great way to adapt one type of barrel to many different gun types. There are two types of barrel threads available which are A5 and Autococker and you also have the option of the 6 piece bore kit or the 9 piece bore kit.