Actually, looking at the sculpts, I reckon those are Mike Broadbent sculpts. I never saw them released by anyone but he did a small range they did include the firing over the head pose. The moulding error on the AK magazine looks like his stuff, it appears on his Kriegspiel miniatures weapons.
Now that I come to think of it, the other ones I was thinking of had overly long barrels, so definitely not them.