GOG Freak XL Barrel Back For Autococker Black PolishedThe new Freak XL back is removed from the marker quickly with just four turns. This lets you get the barrel on and off of any marker faster, while staying compatible with the most common barrel thread in paintball. Fast front to back threading Because the Freak XL is its own system, we where able to utilize a course thread between the barrel front and barrel back. This threading makes taking the barrel apart or putting it together faster then ever.