BL 4.5in Mk. I & Mk. II

BL 4.5in Mk. I & Mk. II
Image: BL 4.5in Mk. I & Mk. II
Year1938 (Mk. I) 1941 (Mk. II)
Weapon TypeMedium Gun
Origin & DesignerBritain/Various
Numbers Produced76 (Mk. I) 649 (Mk. II)
Elevation-5° to +45°
BreechWellin Screw
Gun SightNo. 7 Dial Sight
Gun Mount[@gun_mounts]
CarriageSplit Trail
Gun Shield[@gun_shield]
Armoured Plate[@armoured_plate]
Barrel Length4.690mm (L/41)
Overall Length8.07m
WeightIn Action: 5.900 kg
Round Weight24.95 kg
Muzzle Velocity690 m/s
Magazine Capacity[@magazine_capacity]
Practical Rate of Fire[@practical_rate_of_fire]
Rate of Fire3 r.p.m.
Maximum Rate of Fire[@maximum_rate_of_fire]
Maximum Ceiling[@maximum_ceiling]
Maximum Ground Range[@maximum_ground_range]
Maximum Range18.737m
Armour Penetration[@armour_penetration]
TractionMotorised (AEC Matador)
NotesDesigned as a replacement for the 60 pounder gun the first 4.5in Mk. I guns arrived in 1938 and shared the same carriage as the 60 pdr. The gun itself had a long range which made it suitable for counter battery fire, but its ordnance suffered from low HE content. The Mk. II was issued in 1941 and was mounted on the same carriage as the 5.5in gun. The Mk. I gun first saw action in France with the BEF and around 32 were left behind. It later served in Greece and North Africa. The Mk. II also saw action in North Africa and later in Italy and Northern Europe. The weapon was withdrawn in 1945 and used for training and replaced by the 5.5in gun.