Carriage Mk 1 - Original pole trail and hydro-spring recoil system, 1904.
Carriage Mk 1* - Mk I modified with hydropneumatic recoil system, 1916.
Carriage Mk 1R - Mk 1 fitted with solid rubber tyres.
Carriage Mk 1*R - Mk I* fitted with solid rubber tyres.
Carriage Mk 1** - Mk 1* with lengthened cradle.
Carriage Mk 1C - Mk 1 fitted with lengthened cradle.
Carriage Mk 1D - Mk 1 with cradle from Mk 2 carriage.
Carriage Mk 2 - New manufacture guns incorprating all the Mk 1 improvements.
Carriage Mk 2* - Mk 1* fitted with Mk 2 cradle.
Carriage Mk 2PA - Martin-Parry conversion with pneumatic tyres.
Carriage Mk 2R - Fitted with solid rubber tyres.
Carriage Mk 3 - Box trail carriage for Mk 4 gun.
Carriage Mk 3T - Mk 3 modified to Mk 4 carriage standard.
Carriage Mk 3* - Carriage with increased elevation.
Carriage Mk 4 - New trail.
Carriage Mk 4P - Fitted with pneumatic tyres.
Carriage Mk 4R - Fitted with solid rubber tyres.
Carriage Mk 4TR - Mk 4 with limited elevation.
Carriage Mk 5 - Split trail version.
Carriage Mk 5R - Split trail version with solid rubber tyres.
Carriage Mk 5P - Split trail version with pneumatic tyres and decreased elevation.
Ordnance Mk 1 - Original wire-wound, screw breech production model, 1904.
Ordnance Mk 1* - Repaired Mk 1.
Ordnance Mk 2 - Improved barrel assembled by hydraulic press, 1906.
Ordnance Mk 2 on Carriage Mk 1*
Ordnance Mk 2* - Mk 2 converted to anti-aircraft use, 1915.
Ordnance Mk 3 - Experimental barrel, 1917.
Ordnance Mk 4 - Fitted with Ashbury breech mechanism, 1918.
Ordnance Mk 4 on Carriage Mk 4
Ordnance Mk 4 on Carriage Mk 5P
Ordnance Mk 4A - Repaired Mk IV with auto-frettaged loose liner, 1935.
Ordnance Mk 4B - New manufacture Mk IVA, 1935.
Ordnance Mk 5 - Version of Mk IV for SP mounting, 1926.
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