What is the purpose of the M199 Dummy round?

The M199 Dummy round is primarily used for function checks of firearms. This training aid allows personnel to practice loading, cycling, and unloading a weapon without the risk associated with live ammunition. Since the M199 is inert, it enables security forces to familiarize themselves with weapon handling techniques and to ensure that the firearm operates as intended without the presence of live ammunition. This is essential for safety and proper maintenance practices, helping to identify potential malfunctions in the weapon system before engaging in live fire exercises. The use of dummy rounds in function checks is a crucial step for maintaining proficiency in weapon handling and addressing any issues prior to operational use.