Very nice image.
20 pounder (Tank) Type A barrels had a counterbalance at the muzzle, while Type B barrels (introduced about 1956) had a fume extractor and a 'muzzle swelling'. Balancing the Type B barrel involved welding weights to the topside of the fume extractor.
There was also a Type C barrel.
All three were interchangeable, but fitting a Type B barrel also involved changes to the depression stop rail around the rear deck, and to the barrel travelling clamp.
Mike C
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