Aha!
There is a thought right? Now remember if you look carefully the 20 mm guns were stowed barrel up under that canvas cover.
Or you can try to scratch those puppies, which I don't recommend. I have built that ship. Now, you do try to remember this. The ship is small, so try to get her color Before they went blue.
If you don't ,she will disappear into the darkest corner of your cabinet never to be seen again. This model's size, as it turns out, makes sea blue and deck blue help to obscure any fine work or small deck fittings of P.E . disappear