Things have changed, there is a video around here showing Colts operation. They make their own barrels, bolts and carriers, uppers, lowers and a lot of small parts.

And then there's QC which led to Colt refusing parts that didn't meet their standards. Those parts went somewhere, I promise you that. The "parts is parts" line is wrong. If a man can't tell dpms parts from Colt parts, he ain't looking close enough.

Before you call me a Colt snob, I no longer own a factory gun from any company but I've seen enough to know what I'll trust and what I won't.