Which of the following is NOT part of the prefire checks for the M777A2?

The procedure for prefire checks on the M777A2 Howitzer is critical for ensuring safety and operational readiness. Each component of the prefire check serves an important purpose.

The firing pin check involves verifying that the firing mechanism is functioning correctly and that the firing pin is not obstructed. This check is essential to prevent accidental discharges and to ensure reliable operation when the cannon is fired, making it a key component of the prefire checks.

In contrast, the tasks included in the prefire checks generally revolve around ensuring the weapon system is clear, secure, and ready for action. Activities such as bore clearing, confirming five points of contact for stability, and checking that the oil index pin is flush are all about ensuring the Howitzer is safe and stable for firing operations. Therefore, while the firing pin check is vital for the overall safety and operation, it is not explicitly considered a part of the standard prefire checks listed for the M777A2, which focuses more on stability and readiness rather than the internal mechanisms of the firing system.