What must be true of the M16 standard load?

The standard load for an M16 requires that a magazine is inserted in the magazine well. This is essential because the M16 is designed to be ready for immediate use, and having a magazine inserted ensures that the shooter can quickly engage targets without the need to reload. The presence of the magazine allows for the chambering of rounds, facilitating rapid fire when needed.

Having the magazine in the well prepares the weapon for action and is fundamental in tactical situations, where the objective is to minimize downtime during engagement. This practice ensures that the weapon is operationally ready and meets the readiness standards expected of a tactical firearm.