Check this little gem out......

Looks like I have my model #'s off.....I think it's a .22 cal version of the M-1919A4

"As World War II approached, the Ordnance Department was committed to developing an air-cooled machine gun for infantry use. The result was the M1919A4.

At 41 lbs for gun and tripod, the M1919A4 was much lighter than the water-cooled M1917A1 (93 lbs for gun and tripod). On the other hand, the air-cooled weapon was unable to maintain the same level of sustained fire as the water-cooled M1917A1, and did not have the steadiness of accuracy as the heavier weapon. But its light weight and ease of set-up made it much more useful as an offensive weapon than the water-cooled guns."



http://www.youtube.com/watch?v=abTGAP7tG0Y&NR=1

C/22

Very cool
I looked into getting one but they are expensive