How many kilograms is an M-67 grenade approximately?

The M-67 grenade is known to weigh approximately 0.4 kilograms (kg). This weight is significant for understanding the grenade's use in combat situations, as it affects how easily soldiers can carry and deploy the ordnance.

While the other options suggest weights lower than 0.4 kg, they do not accurately represent the M-67's design specifications. The weight of the grenade is crucial not only for the handling and carrying logistics of soldiers but also for understanding how it fits within the overall arsenal and capabilities of the Ranger Regiment. Thus, selecting a weight around 0.4 kg reflects the correct specifications and recognizes the adaptability and usability of the grenade in various tactical scenarios.