Originally Posted by
lysander
For AR-type rifle barrels the chrome plating of the bore is always done after the barrel extension is installed and usually after the gas port drilled. This is done so the chamber can be finish reamed to the proper distance from the locking lugs.
However, in order to chrome plate anything you have to have an electrode and good electrolyte flow around the area to be plated. Plating inside a 0.092" hole is not worth the trouble, it wouldn't help much. The chrome plating feathers up into the port on the bore side.
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