Changes in temperature and humidity cause paintballs to shrink or swell. 

The Freak XL are the only barrel systems that match paint size 

by utilizing inter-changeable sized aluminium inserts. 

There are 9 different sizes and each size has its own color for 

easy identification. 

The insert sits inside the back piece of the barrel.

Results:

Increased accuracy
Better gas efficiency
Decreased chance of breaking paintball