The AR 500 units that hold up weigh over 8.5 pounds. That is heavy.
I am shooting for a design with way less weight than that.
This data tells me I must test against barrels of 16″ and also 20″.
I have told you in the past that better armor is required and now the need has been shown to be even greater.
Also, our military going to 14.5″ barrels is a bad thing. Police are going even shorter.
Those lengths are pretty easy to stop. And the round is way less effective out of such barrels.