The Aluminium Freak Insert is an excellent and highly recommended product. Changes in temperature can cause paintballs to shrink or swell. This is the only barrel of its type that can match paint size by utilizing inter-changeable sized aluminium inserts. There are 9 different sizes and each size has its own colour for easy identification. The insert sits inside the back piece of the barrel. Using this barrel you will see a number of positive changes including increased accuracy, better gas efficiency and a decreased chance of breaking paintballs. Be aware that this product can only be used in the Freak back or Freak Junior Back. You can get the bore in many different sizes including .682, .684, .687, .689, .691 and .693.
