Ordnance Q.F. 1.59 inch (40.4 m/m) 15.4 calibres. Arrangement of gun and tripod mounting. Firing position Ordnance Q.F. 1.59 inch (40.4 m/m) 15.4 calibres. Arrangement of gun and cradle Ordnance Q.F. 1.59 inch (40.4 m/m) 15.4 calibres Ordnance Q.F. 1.59 inch (40.4 m/m) 15.4 calibres. Arrangement of breech mechanism and firing gear Ordnance Q.F. 6 pdr ( 57 m/m) 20 calibres. Arrangement of carriage Ordnance Q.F. 6 pdr ( 57 m/m) 20 calibres Ordnance Q.F. 6 pdr ( 57 m/m) 20 calibres. Section third buffer and recuperator Ordnance Q.F. 1.59 inch (40.4 m/m) 15.4 calibres. Arrangement of gun and tripod mounting. Carrying position