Which of the following is NOT a sub-component of the upper receiver assembly?

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Multiple Choice

Which of the following is NOT a sub-component of the upper receiver assembly?

The upper receiver assembly includes parts that sit at the front of the rifle and interact with the barrel and ejection system: the barrel itself, the ejection port cover, and the front sight assembly. The buttstock belongs to the lower receiver assembly and provides shoulder support, not part of the upper. Since the question asks which item is not a sub-component of the upper receiver, the buttstock is the correct choice.

The upper receiver assembly includes parts that sit at the front of the rifle and interact with the barrel and ejection system: the barrel itself, the ejection port cover, and the front sight assembly. The buttstock belongs to the lower receiver assembly and provides shoulder support, not part of the upper. Since the question asks which item is not a sub-component of the upper receiver, the buttstock is the correct choice.

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