Someone posted this on Facebook, apparently. Hopefully he’s not friends with any ATF agents, and hopefully does not own a dog. Putting a fore grip on a pistol turns it into an AOW from a handgun. You can do it legally, but you have to register the gun as an AOW and pay the tax. Some speculation on AR15.com that it was Airsoft. You can see from the nice big rifled barrel showing in the pic that it is not.
Hat Tip to Lucky Gunner.
UPDATE: Original Facebook page here. Dude would seem to be in the Army, but unless that pistol is government issue, it’s still a felony if it was done in the United States. Not sure about if it was done in Iraq or Afghanistan.