This short report, with sourced data and photos by Conflict Arnaments Research popped up yesterday on a US origin emailed daily briefing and in The Guardian today.

Link:http://conflictarm.com/images/dispatch_iraq_syria.pdf

I've never heard of them and their website has no named staff. Anyway this is their explanation:
Conflict Armament Research identifies and tracks conventional weapons in contemporary armed conflicts. Established in 2011, it was created in response to the growing need for informed, on-the-ground reporting on weapons proliferation in modern wars and insurgencies.
I have added this post here in view of the exchange in the last few posts.