A groove for the det ring would need to be cut, and that very often leads once again to chipping of the plating. It's the machining to the edge of the plating that chips it away, and is more often than not, unavoidable. Det rings are not the answer.

Done properly, the [detonation ring] groove is cut, then the barrel sent for plating. Once returned, the det ring is pressed into place, and finished to perfectly match the "new" bore.

You may get lucky and cut a groove without more damage to the plating, and consequently not need to replate, but I'd put 50p on it not being the case.

Irrespective of all that, a good chunk has been taken off the top of the barrel, the plating is now chipped, and in need of repair... that barrel is scrap for anything other than a 40hp stocker that never ventures more than a couple miles/walking distance from home. Bite the bullet, and source another one.
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Andy.
NSR-WORLD.COM

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