This gives you the ability to check the remaining rounds of ammunition in your currently loaded magazine.

A hint will pop up and show you in words the approx. amount of rounds left in your magazine.  

When you reload your magazine, the same hint will be shown. That way you will always know if you are reloading a fresh magazine or a half empty one.

Limitations

• This feature overrides the default ArmA2 action for sitting down, that will not be available while using ACE.
• The system does not indicate the status of a grenade launcher like the M203.