I think pictured are 4 10 rd and a 30-40 rd. I have more than this. I think they are the size of the larger one. Sorry I am not familiar enough with the platform to tell you exactly what is there.
I think my friend is correct, looks like this dozen are the early Russian Slab Sides. They have the hole in the follower and the triangle with the arrow on the rear. Pretty heavy too.
don't really want to break the dozen up and I'm sure you don't want to swap 5 for 1