Important and relevant images and videos

[Tesla]

Very thorough test of what an ar15 can do to and ar500 plate.
http://gfycat.com/FixedSaltyBaleenwhale

 

[RocksNGlocks]

Interesting. What grain were they using?

 

[Tesla]

a new M&P is 107.2 oz, so that's about 46.900 grains, by mywolframalpha's math.

 

[drmitchgibson]

Good video for demonstrating barrel break-in as well.