Gun
Overall length: 1.78 metres (5 ft 10 in)
Bore length: 1,500 millimetres (60 in)
Weight: 441 kilograms (972 lb) (Mk1), 463 kilograms (1,021 lb) (Mk2) including breech
Rifling: PPS 32 grooves
Twist: 1 in 510–380 millimetres (20–15 in) increasing twist (Mk I)
1 in 510 millimetres (20 in) uniform twist (Mk II)
Breech: horizontal sliding block
Carriage
Weight: 1,400 kilograms (27 cwt)  total weight
Width: 2.06 metres (6 ft 9 in)
Recoil: 1,000 millimetres (40 in) (0° elevation) 510 millimetres (20 in) (45° elevation)
Elevation: -5° to +45°
Traverse: 3° right and left
Ammunition
"Shell HE" Mk 12 to 16 – 2.0 kilograms (4.3 lb) Amatol or TNT filled.
Minor differences between marks
"Shell smoke bursting" Mk 3 to 11 – white phosphorus filled
"Shell smoke base ejection" Mk 1 – hexachloroethane-zinc filled
"Shell star" Mk 3 – star unit and parachute with fuze time and percussion No.
221
Shell weight: 16 kilograms (35 lb)
Propellant charge: five parts, from 0.18 to 0.45 kilograms (0.4 to 1 lb) loaded into a 86-millimetre (3.4 in)l ong brass case
Gun
Overall length: 1.78 metres (5 ft 10 in)
Bore length: 1,500 millimetres (60 in)
Weight: 441 kilograms (972 lb) (Mk1), 463 kilograms (1,021 lb) (Mk2) including breech
Rifling: PPS 32 grooves
Twist: 1 in 510–380 millimetres (20–15 in) increasing twist (Mk I)
1 in 510 millimetres (20 in) uniform twist (Mk II)
Breech: horizontal sliding block
Carriage
Weight: 1,400 kilograms (27 cwt)  total weight
Width: 2.06 metres (6 ft 9 in)
Recoil: 1,000 millimetres (40 in) (0° elevation) 510 millimetres (20 in) (45° elevation)
Elevation: -5° to +45°
Traverse: 3° right and left
Ammunition
"Shell HE" Mk 12 to 16 – 2.0 kilograms (4.3 lb) Amatol or TNT filled. Minor differences between marks
"Shell smoke bursting" Mk 3 to 11 – white phosphorus filled
"Shell smoke base ejection" Mk 1 – hexachloroethane-zinc filled
"Shell star" Mk 3 – star unit and parachute with fuze time and percussion No. 221
Shell weight: 16 kilograms (35 lb)
Propellant charge: five parts, from 0.18 to 0.45 kilograms (0.4 to 1 lb) loaded into a 86-millimetre (3.4 in)l ong brass case
QF 4.5-inch howitzer