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Air in a can to cool barrel?

I've been using an air mattress pump, tygon tubing and a nylon tube I made to fit the receiver. It works great but EATS batteries. Two or three trips to the range and it's time to buy another six C size. I ordered the barrel cool. I use the same size batteries in a couple flashlights and buy them in bulk so will see how it works out.
 
I've been using an air mattress pump, tygon tubing and a nylon tube I made to fit the receiver. It works great but EATS batteries. Two or three trips to the range and it's time to buy another six C size. I ordered the barrel cool. I use the same size batteries in a couple flashlights and buy them in bulk so will see how it works out.

Try the fish tank pump! I've used mine 3 times on the same set of batteries and it's still going. I buy the cheapest batteries I can find.
 

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