Hello members of BOCN! I am new to the forum and have been referred here to try and find a possible identification on these objects that I keep finding while metal detecting.I have taken a few pictures which are below. They are rather heavy, solid, and I assume are made of brass. Have been finding them around old war bunkers that overlook the sea along with bullets (mainly .303 shells) and shrapnel. Each one has the letters "AC" within a hexagonal box, and a letter P.Any information would be greatly appreciated