What Pat calls low to mid grade guns are in fact only separated from the BCM's, LMT's and Colts by MPI bolt testing. These can be less prone to failure under long durations of extended fire and are the most common failure in any AR. I hate to break it to you but the difference is very little and really only applies to full auto fire. Hell, I've seen people try to debate this with him, on other forums, and then get banned and then bashed by him, without reprisal. I don't know this forums polices of posting other forums but I'd be glad to PM you the name of the other forum so you can see for yourself what happens to those that disagree with him. That is the character I've come to mistrust. I will form my own opinions from my own experiences, the way he has, and the way you should. I'll take no other mans word on what weapon is best to defend my life with. I'll put it through the paces myself, not trust Pat Rogers and his Colt carrying neophytes. As for his dislike of Sig's I didn't say specifically Sig's, I said "like" the Sig 556. It has been reported from people in more than one of his classes about his dislike of piston type AR's and there being no need for them when his Colt will run fine all lubed up. That doesn't mean he is right. The two Bushmasters I own have been run through multiple courses, 3 gun events, and plinking. I've yet to replace anything on them. Nothing. I have fired over 40,000 rounds between the two and haven't cleaned one of them in the past 8,000 rounds. I'm just waiting for it to fail. I know of others with similar results with what you have called $500 AR's and Colts and Larue rifles. It doesn't require luck or a Pony stamped on the side of the receiver. The AR platform only has a couple weaknesses and if you prepare to cover those eventualities you'll be fine. And as I've stated before I've seen more Colts go down than any other manufacturer. That however doesn't mean all Colts are now complete junk and because I say so you should believe that and never buy one because of it. Form your own opinion.