Yeah, also to the input about the strength of the two "Garrand-style lugs." That's probably why you see so many Minis in the hands of the world's armed forces!!!
The Worlds armed forces almost exclusively do not handload ammunition for their "Auntie Ems".
Many people have handloaded for the mini and it has a long and proven history of handling hot loaded ammunition. Its simply a very rugged tough action. It has very small contact services with the reciever during action cycling and this is also a plus when you factor in Dust and crud build up that would bring an M16 to its knees.
Its much easier to clean than the M16
However I don't own a mini anymore, however I have been tempted lately with the newer tactical versions.