Paul, Not that big axel pin (it looks just fine). The retaining pin I speak of is seen if you look at the top surface of the gun. The pin is tiny, 1/16" in diamenter. I is driven in flush between the two knurled knobs. It sits to the left, offcenter. You cannot remove it easily, that is not necessary. The tiny 1/16" diameter head of that pin should be in the white (or maybe have some fire blue), white is like the one shown below. The more I look at your gun the more I think it correct. Very hard to tell if a gun is correct from pictures alone and cell phone pictures make it even harder. If the local experts say ok, and you like it too, I would go for it.
