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Index mark.

Q In your articles you some times mention an index mark. Just what is an index mark?

A When you have two parts that got together, you will often have marks on the individual pieces. These marks when aligned are used to indicate the optimal positioning of the two Components. For example, it is very common to have a small line on both the barrel and receiver of a rifle that are positioned opposite one another and often actually touch. If the barrel is removed and then reinstalled, it is easy to make sure it is properly, positioned or "indexed" by checking the position of these two index marks. If they are aligned with one another, the barrel and receiver are assembled correctly,

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Title Annotation:Ask the Gunsmith; gunsights
Author:Coffield, Reid
Publication:Shotgun News
Article Type:Brief article
Geographic Code:1USA
Date:Dec 10, 2009
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