Barrel Cool

[bsumoba]

You could rig up your own larger battery powered fan.
Battery costs will be a long term annoyance , I suspect far less than hours listed.
Recharagable would be much better.

A large fan blowing across the barrel will most definitely help cool the barrel, but convenience and the required power makes it challenging in many cases. Because BarrelCool doubled as a chamber flag, it can be used at every range in the US during cease fires and will fit in any range bag, rifle bag or pocket.

If you do not have a rack to place a rifle standing upright to take advantage of the "chimney effect," BarrelCool is a good way of getting the same effect with more airflow and with the rifle resting as is, on the bench or shooting station.

Rechargeables have less capacity than standard batteries so they will go out faster, but yes, you can recharge them. With (3) CR123A batteries that each have 1400mAH of capacity, we tested and documented on multiple occasions, approximately 7 hours of battery life in constant ON mode and much more than that while using it intermittently in 20-30 minute intervals. BarrelCool will come with a set of batteries and we also sell some at a very reasonable cost that you can order at the same time.

Is there sufficient room for the unit to pull cooler air into the chamber? One video I watched a week or two ago looked like it filled the chamber on the full side, so you would have to remove the bolt to help with air flow, if that would help any.

The fan is located on the top and there is sufficient space in most actions and firearms for cooler air to be drawn into BarrelCool and through the bore.