Not to make this a Sportsmansguide rave, but I have had fantastic dealings with them.
I've ordered from them several times, each with great customer service, great prices, and prompt shipping.
I seem to remember another place called Quartermaster supply that I had good results on with NIW USGI mags and other related AR stuff, and if I can dig up the link, I will post it in a follow-up.
AS promised, the Quartermaster Supply link. I know this is in Colorado Springs, and many would say an AF base is not a military base, but they do have alot of NEW and like new gear here, so hey, you make the connection.
[url]http://www.qm-supply.com/[/url]
The germ of destruction of our nation is in the power of the judiciary, an irresponsible body - working like gravity by night and by day, gaining a little today and a little tomorrow, and advancing its noiseless step like a thief over the field of jurisdiction, until all shall render powerless the checks of one branch over the other and will become as venal and oppressive as the government from which we separated." -- Thomas Jefferson, 1821