Which round of ammunition contains no propellant or primer for the M249?

The M232 Dummy round is specifically designed to simulate a live round of ammunition for training purposes without containing any propellant or primer. This unique characteristic ensures that the round cannot be fired, making it safe for training environments where the use of live ammunition is not appropriate. Dummy rounds are crucial for firearm handling drills and teaching soldiers about weapon systems without the risks associated with live ammunition.

In contrast, the M200 Blank is designed to produce noise and a muzzle flash when fired, simulating the sound of discharge but without a projectile. The M855 Ball and M993 AP rounds are both live ammunition types, containing propellant and primer necessary for firing and ballistic performance. This differentiation is essential for understanding the roles of each type of ammunition in training and operational contexts.