The adapter is indeed for a 6 inch Mk VI. The end of the insert goes all the way to the end of the muzzle. In Robert Maze's book it describes the tube being developed in the early twenties due to 455 ammunition shortages. Although it helped with learning the sighting techniques the shooter was not able to go through the qualification course. Then Parker Hale developed the 6 shot cylinder and barrel which has the brass nut on the end. Guess I need to be on the hunt for one of those. In shooting the Enfield with the single shot tube it's kind of like a miniature Martini. LOL
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