historical arms series Tudor artillery 1485-1603 / by Adrian B. Caruana Gun drill for Q.(uick) F.(iring) 25-PR Mark 2. Gun on carriages 25-PR, Mark 1 and 3, 1944 Identification list for ordnance, B.L. 5.5-in., Mark 3 and ordnance, B.L. 4.5.-in., Mark 2 on carriage, 5.5-in. or 4.5-in. gun, Mark 2 Identification list for ordnance, B.L. 5.5-inch, Mark III and ordnance, B.L. 4.5.-inch mark II on carriage, 5.5-inch or 4.5-inch gun, mark I