Looks like a toy to me.
Some sort of AR-15 based rifle.
This is the Matel Toy Islaminazi CAP GUN special, $14.95 at WalMart, complete with plastic flashlight scope. Take special note on the stock, behind the breach. This is the location where one would insert the CAP. A real AR-15 carbine would have a large lever that you can unlock and pull back to clear the breach - but this model you just swivel open, insert your CAP, close it, pull the trigger and BANG - you imagine your enemies are dead.
Also notice the classic "my finger is on the trigger" method of grasping the weapon. This is someone who would be an easy target for a professional soldier.
Get's back to the old Marine song "This is my rifle, this is my gun - this one's for kill'n, this one's for fun".
