From what I have always been told, these have two purposes
1. put on the muzzle and then it can be used to clean from the front and not damage anything on the crown
2. they are used to attach the 22 training for a single shot - I have one of these
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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