My issue with this is that everyone accepts this "common knowlege" without question. Did you ever think to ask, "Why?" Just what kind of damage do we think will occur? There is a significant safety factor built into every rifle.
My 2 cents might not mean much to any of you, but here goes...
It might not be in my place to address this, but I did ask myself "why can't I shoot 5.56 NATO in a .223 chambered AR15" when I first wanted my AR.
I did however waste a whole lot of my time, searching the internet for an explanation as to why "everybody" were stating that using 5.56 NATO in a .223 chambered rifle could be "dangerous" and I could not find one single incident where the AR suffered from a catastrophic failure/blown up barrel because a 5.56 round was used in a .223 chambered AR.
What I did find was that it is possible to fire 5.56 in .223 chambers, but the tighter .223 chamber may cause certain types or batches of 5.56 ammunition to fit too tightly, which in some incidents might cause over pressure in the chamber which in turn can caused the primer to back out and get stuck somewhere in the action of the rifle, causing a "mechanical malfunction".
That's it, no barrels blowing up in your face, no blown off fingers, just a primer stuck in your action, causing you to waste time fishing it out of there so you can shoot again.
What I ended up with was a .223 Wylde chamber on my AR so I don't have to worry about if I'm shooting .223 or 5.56 rounds.
There you have it, my 2 cents worth of nothing.
