Any good anagrams for base-ring?

In guns of cast-metal, the flat moulding round the breech at that part where the longitudinal surface ends and the vertical termination or cascable begins. The length of the gun is reckoned from the after-edge of the base-ring to the face of the muzzle: but in built-up guns, there being generally no base-ring moulded, and the breech assuming various forms, the length is measured from the after-extreme of the breech, exclusive of any button or other adjunct.

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