You already knew that, of course. For those of you that ride the short bus, what they’ve labelled the mount for bayonet and grenade launcher is, in fact, the sling swivel. Where you can mount a scary sling. Which is very intimidating. Though most new tactical slings actually mount using the front sight. And the bayonet is mounted on the bayonet lug, which is forward of the sling swivel. And for the record, I’ve been around a bunch of idiots armed with M16/AR15/M4 series weapons, and never yet seen one dumb enough to actually try to use one as a spear. A pike, maybe. But not a spear.
As for the grenade launcher, mounting one uses neither the sling swivel nor the bayonet lug. It has its own hardware kit to mount on the weapon.
Look, if the media gets incredibly simple stuff like this wrong, how well do you think they do on complex issues?
Further evidence of the stupidity, or possibly mendacity, of journalists can be found in this incredibly ill informed piece at Slate. Quite rightly, the comments quickly point out that the author is an idiot, and the evidence he cites actually argues against his thesis.