Actually, both my AR platform guns (the two custom builds) had a recommended procedure to break in the barrel. I followed the procedure, and the groups tightened up. Not that they were built to be tack drivers, I consider anything inside of an 8" circle @ 500+ yards good for the 6.8 & .308. That gives me a torso hit at that range, so I figure I'm good. But they both shoot within 5" at 300 yards, that's with me shooting (old eyes ya know). The guy that builds them is way better (sub 2" groups). My other guns have had 1000s of rounds through them and my revolvers have had the actions smoothed out by a smith. Frog lube is my preferred lube for all my toys. Works good and doesn't wash off if it gets rained on.
