The VCDL blog The Sentinel is quick to point out that the Assault Thingies turned in during a LA gun buyback program were as fake as fake can be. Good eye!
Also pointed out in comments at the LA Times article is that since the guns are made of rubber and scrap metal, they can't actually be "cleared" because they don't fire cartridges and they don't have removable magazines! What were those deputies thinking?
Nothing like getting $5,800 for some junk!