Talk:M134 Minigun/@comment-109.237.36.114-20120425134405/@comment-4585544-20120426043738

5.56×45mm NATO is what the XM214 Microgun fires which would be the = of the portable version of the M134 as the XM214 Microgun was made in real life, tho only a few were made, unlike the jackhammer where it was only on paper.

the real M134 fires 7.62×51mm NATO but it's only mounted in vehciles or in defensive postions/etc. as for the .50 caliber, im not aware of any Gatling gun/cannon in a .50 cal. but one could have been made for expermental trials.

the M61 Vulcan is a 20mm rotary cannon. ( because the 20mm round is a tank/cannon round, hence why it's considered a cannon.)  the biggest one that I can say that gets a LOT of use would be the GAU-8 Avenger, which is on the A-10 Thunderbolt II  and it uses 30mm rounds and is used for CAS ( Close Air Support) and will pretty much blow up anything in it's line of fire. (tanks, bunkers, troops, etc.)