A term often bandied about, especially concerning AR pattern rifles. What's your take? Personally, I take comfort that my chosen defensive rifle(Colt 6920)meets that criteria. Do I think it has the be all and end all NASA-spec parts? Not at all. To me, mil-spec is the minimum in a serious defensive rifle, at least as far as ARs go. Am I one of those "your second-tier AR sucks" snobs? Not at all. It all depends on what you want to do with your rifle. I'm also very curious about the durability of US produced AK parts. Especially the Tapco G2 and gas piston assemblies.