Pocket carry AR in 223

to begin with: Doesn't "AR" stand for "Automatic Rifle"?

I can see neither rifle characteristics nor any automatic function in this piece...

The only (somewhat) reasonable use I could imagine for this pistol would be having a small handgun that uses the same ammunition as your main platform... Still, a small .22lr PLUS ammo would weight about the same and be more effective...
 
"Velocity drops rapidly as the barrel length decreases, especially below 10 inches where the velocity drops below 2,500 fps. M855 bullets traveling below 2,500 fps when impacting a target will not produce a lethal wound channel."

BARREL LENGTH STUDIES IN 5.56MM NATO WEAPONS

I'm sure it would still at least hurt out of such a short barrel.. Looking at this study I suspect there would be a lot of flash and noise as well...and the chamber pressure would be horrendous. It's just my guess though.
 
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