Sir,
If it is not too much trouble, please post/ add a picture of the breech end of your barrels and the rifle tube and its muzzle end attachment.
I have a friend who has read about these type of rifle insert tubes and has two guns which have small cut outs at the breech end which he believes was to fit rifle tubes. He is currently having sets of these made so he may shoot them at the Vintagers rifle competitions.
I have only heard about these types of inserts but never seen any before.
Thank you,
John Truitt
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