It seems another company is selling felonies-in-a-box for the AR.
Out of the host of dumb things I've seen hung under a carbine barrel, this one takes the cake.
The most plausible and least stupid are grenade launchers. And by "grenade launchers" I mean actual M203 grenade launchers. Those 37mm flare things you see on folks' guns at shows may be fun, but they just have a bit too much whiff of "airsoft poser" for me to want to put one on my own gun. I can't figure out what it is supposed to do.
Next silliest are shotguns. I mean, sure the short-barreled shotguns look silly and are about as useful on a civilian carbine as a screen door on a submarine, but they do kind of make sense for breaching use in those lines of work where things get breached. (...and paint me a scenario where you're actually going to need a breaching weapon if your first name isn't "Spc.")
Dumber even than that is the M4-mounted Taser. I understand the desire for a handy less-lethal weapon, but is putting a second trigger on your plenty-lethal carbine the way to do it? One finger launches an electrified barb and the other launches a 75gr Hornady TAP: "Gee, Chief, I didn't mean to centerpunch Mrs. Johnson like that. I was just trying to calm her down with the taser..." You don't want pink mist when all you wanted was some compliance.
But this pistol doohickey? That's like a kickstand on a tank. I have sat here and scratched my head for fifteen minutes and can't think of a single thing it makes better. It makes the carbine heavier and slower to point, more likely to hang up on crap, it shoots about a foot below the sights at point-blank range and much further out than that, well, you might as well throw rocks... What does it do? What possible function is it supposed to perform? And what is rigidly covering that Glock's trigger guard so that an errant fastex buckle or leafy twig doesn't get really noisy?
(H/T to Unc.)