This is the easy way to help keep your barrel cool during matches.

It inserts into the action port and blows air through the barrel.

This cooler has an electric fan which has a USB plug.

You can buy a cheap USB power pack to run it, or use your phone charger if you have 240v power available.

The brushless fan is almost silent.

The plastic part is 3D printed to a custom design.

The prototypes I made were blue, but the production units will be fluro yellow so they can act as a chamber flag as well.