The photos were taken at the Combined Military Services Museum in Maldon, Essex. It is well worth a visit if you are in the area; the firearms collection alone is very impressive. They also have these:
I had my hands on a few of those bling Iraqi AK's and even tried getting the chrome on pictured back to the UK via proper channels but ran out of time. Some of the stuff I photographed ended up in some AK book a while back. The most interesting place for me was the "sexy" offices in Baghdad (if you know, you know). as it was wall to wall weapons with some interesting stuff to say the least.