I dunno, I'm not privy to their intergovernmental records or their military sales records. I can think of a couple on the list that would definitely be candidates.How many of those countries arm "moderate rebels" like ISIS and alqaeda, or just leave millions of dollars worth in Afghanistan?
The US also sells/gives away a ton of AK variants as well, but that doesn't play out the same for soundbites. Same as when the Iranians started selling the Sayaad suddenly every M16 seen anywhere was provided by the US.
Are M4's that come from the US in Gaza, probably...they are all over the rest of the world as well. Is the US the only country in the world where one could get an M4....no...