Which round has six grooves along the side of the case and contains no projectile or propellants, used for training purposes?

• A. M199
• B. M200
• C. Dummy Round
• D. Blank Round

Answer: (C)

Focus on identifying inert practice ammunition. A dummy round is designed to look like a real cartridge but contains no projectile and no propellant. That combination makes it safe for training because you can cycle it through a firearm, practice loading, chambering, and ejection, and perform safety checks without the risk of discharge. The six grooves along the side of the case are a distinctive feature used to mark these inert training cartridges, helping shooters recognize them at a glance. In contrast, live rounds include a projectile and propellant, and blanks contain propellant (but no projectile) and still produce a muzzle blast, so they’re not inert for dry-fire training.