I would say skip it.
Looks like a two year old tried to copy someone's barrel markings.
Most likely someone has used a upper with m4 cuts and attached a a2 cut barrel and is trying to off load a hot mess
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent