What characterizes the failure to chamber malfunction when using the M249 AR?

Prepare for the Combat Arms Training and Maintenance CDC Test with flashcards and multiple choice questions. Each question provides hints and explanations to ensure you're ready for the exam!

The failure to chamber malfunction in the M249 AR is characterized by a round of ammunition not being fully seated in the barrel. This can occur if the round does not enter the chamber completely, preventing the bolt from fully closing and securing the round in place. This situation can lead to a failure to fire, as the weapon cannot complete the cycling process necessary for operation.

While factors such as ammunition size and the condition of the feed tray can contribute to malfunctions, they do not specifically describe a failure to chamber. The key aspect of option B is that it directly addresses the condition of the round in relation to the chambering process, which is crucial for the function of the firearm. Misfiring, while an issue, does not relate to the failure to chamber as it occurs after chambering has already taken place, further highlighting why the described condition focuses on the seating of the round.

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