Looks like a good way to cool one off. I’ve seen the little units made for barrel cooling and am not impressed.
We do not have a managed rifle range in my area so I shoot on BLM at a range we set up using fence posts pounded in with oak pallets for target holders. My truck is always only a few feet from my home made shooting bench. I’ve found that the best way to cool a barrel is to get it out of the sun and leave the rifle on the front seat of the truck with the air conditioner blasting. Cools ‘em pretty fast.
We do not have a managed rifle range in my area so I shoot on BLM at a range we set up using fence posts pounded in with oak pallets for target holders. My truck is always only a few feet from my home made shooting bench. I’ve found that the best way to cool a barrel is to get it out of the sun and leave the rifle on the front seat of the truck with the air conditioner blasting. Cools ‘em pretty fast.