re: ***UPDATE NO.3**My new AR is cycling .223 fine but hanging up on 5.56

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It will tell you if it is even safe to fire the thing with 5.56mm ammo. I don't know about you, Clames, but that's a big deal for me.

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Are you trying to preach to the choir? Think I don't know that or have a few sets of gauges of my own? My point though, was that given this is a 5.56 chambered upper and looking at how the problem has been described I'd try something else first.

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but I'm a cautious guy with firearms

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So am I, but I'm also a better trouble shooter and know these rifles better than 99% of those that post here too. Also trying to teach the OP how to properly look through this issue too, which means examining all the parts involved which necessitates photos.