QF 6 inch/40 gun
QF 6 inch/40 gun is a rifled breech loader or naval artillery.
Overview
British naval artillery.
In detail
It is associated with United Kingdom of Great Britain and Ireland.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“QF 6-inch naval gun”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1642887: QF 6 inch/40 gun
Consult the source