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0331 Machine Gun Practice Test

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Which of the following is NOT one of the eight main assemblies of the M240B nomenclature?
Correct Answer:
Sighting assembly
Explanation:
Understanding how the M240B is organized for maintenance helps you see why this option is the odd one out. The eight main assemblies are the large functional blocks you would disassemble and service as units—things like the barrel, the buttstock and buffer, and the feed tray are all part of those major groups. The sighting system, while essential for aiming, isn’t counted among those eight primary assemblies. It’s a separate subsystem used for aiming and optics, not one of the eight main assembly blocks. So a sighting assembly isn’t one of the eight, making it the correct choice.

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