Interesting rifle. I notice the block lacks a thumb tab. That suggests a side or bottom lever for the block possibly with a linked block and hammer. It doesn't appear to be the military action.
Jerry Liles
I don't think it's missing Jerry. I think its just hid by the angle of view, looking straight on to the thumb tab.
It looks very civilian to me rather than Military, too.
Not one of the later actions as it does not have the Mickey Mouse Ear thumb piece, but barreled in the same style as the 8x58 Military models.
Cheers
Trev