He's talking about Patriot Ordnance Firearms. It's a gas-piston 308 very similar to an AR-10. They make a gas-piston .223 which is pretty much an AR-15. I have a friend with the POF 415 (223) and its a great gun. I did quite a bit of research on them and the company seems very good, anyone who ever posted about having a problem with their gun always posted later that POF took care of the issue quickly. That said the only problems I read about were on the 308's. A problem that popped up more than once was accuracy issues caused by the quad rail not really free floating or causing some kind of issues I really don't remember the specifics of it.