I've been shooting the M-16/AR platforms for a lot of years but never paid that much attention to the differences between the military and various civilian models, expecially if they worked for me. I've got more than 6,000 rounds through an employer-furnished Rock River carbine, and have had a total of three stoppages over the course of six years (one with an old overloaded mag, and the other two a result of blown primers on a bad lot of ammo). I was planning to acquire a Rock River for personal use, but the buzz word in all the magazine articles about ARs is "Mil-Spec." Are the Rock River tactical carbines considered mil-spec? I've notices subtile differences here and there, but I've seen nothing break or wear out prematurely, and I've come appreciate the shootability of the Rock River. What are your thoughts?