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Between an AC556 or an AR/M16 type firearm, I'll take the AR/M16 first.
Why? Don't forget that one of the easiest and quickest ways to wear out a barrel is sustained full auto fire. That's fine if you're in the military and you've got someone else who will pay for the ammo and to replace the worn barrel. But when it comes out of your own pocket, ouch!
Here's my concern about the AC556. There's only one outfit which will replace it a barrel: Ruger. Sure, gunsmiths can do it, but Ruger will take the liability as it is their gun. Problem is the down time while it's sitting in customer service waiting for an employee who will screw on the new barrel.
With an AR/M16, if you've got a good vise and the proper wrench, you can replace the barrel yourself. It's easy and the barrel wrench is only about $40. You don't even need a barrel block to clamp the barrel in and you can make it out of oak. So, if you want the ease of maintenance, the AR is the way to go.
By the way, I've got armorer's tools for both the AR and the Ruger. My set of Ruger tools are sold by Ruger only to LE armorers and it cost over $450. You won't have to spend half that amount to have the tools to work on the AR. Just my two cents.
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