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For MANY firearms (but not all) the sights may be adjustable by the user. However, in the case of a shotgun with bead sights, or a revolver with fixed sights, they are not adjustable. Some semi=auto pistols have sights that can be adjusted by a gunsmith. Most rifles will have a user-adjustable sight.

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Q: Which component of a firearm can you adjust without the help of a gunsmith?
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