We take a look at the AAC Mini 4 for 5.56 rifles. The AAC Mini-4 is the result of a request for an ultra-compact can for 5.56mm rifles and carbines. The Mini4 features the same fully welded all-Inconel guts as our M4-2000. With an overall weight of 13 ounces and adding less than 3 inches to the overall length of the host weapon, it is easy to disregard the Mini4 until the shooting starts.