Man if you saw what we used back in mid 2000's shooting p'dogs mid summer in +100degree days. We'd take 7-8 rifles just because everything would get so hot so fast on the towns. I brought a old CO2 tank with a line and would keep it in the tailgate of the truck. After shooting a rifle we'd lay it in a cradle insert the line and let the CO2 blow for a few min and it would make those barrels cold! Cost us about $35 to refill it each season but it worked, bit bulky.
Better than the $100 shop versions.
I use a manual foot pump for my air mattress
Man if you saw what we used back in mid 2000's shooting p'dogs mid summer in +100degree days. We'd take 7-8 rifles just because everything would get so hot so fast on the towns. I brought a old CO2 tank with a line and would keep it in the tailgate of the truck. After shooting a rifle we'd lay it in a cradle insert the line and let the CO2 blow for a few min and it would make those barrels cold! Cost us about $35 to refill it each season but it worked, bit bulky.
those blowers like the magnetospeed blower are far to NOISY !