There is a "soft" plate armor that can stop either a NATO 5.56 or 7.62. [video=youtube;mt5hJORcbkQ]http://www.youtube.com/watch?v=mt5hJORcbkQ[/video] I don't think I can stand out in the open like Rambo and fire off hundreds of rounds in a firefight and be alive for long without wearing at least a LV III vest.
I would like to see if one of those plates will stop a steel-cored round from a .22-250 target rifle. Or one from a .577 Tyrannosaur. - - - Updated - - - Getting hit would still be a bit like getting in the way of a right hook from Evander Holyfield, though!