I'm not toooooo sure about that 5th Batt. We had all sorts and all sorts came as replacements from/with the same part number. If I remember too, there was also a little short one, similar to but shorter than the closed-end No4 type. If one or other of the others were obsolescent or obsolete it'd be in the parts list like the PLATE, insert or the early type No5 grenade launcher. The insert plate was another biut that was made to rust out. Just take it out and leave it out!
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