Hi Kuba.
You is right. Serves me right for just using the color profile and not looking closer at the pics. The 'pipe' is an extended blast tube. Should have looked at the cut-away drawing Vol 3, as well.
So was 4 30 mm cannons. So sorry claude for steering you wrong.
To make up, go to the Helpdesk at,
www.ipmsstockholm.org/