The objective of this manual is to allow the reader to be able to use the MK19, Mod3 Automatic Grenade Launcher competently. The manual will give the reader background/specifications of the weapon, instructions on its operation, disassembly and assembly; proper firing procedure; and malfunction/misfire procedures. Operator level maintenance will also be detailed to allow the reader to understand and become competent in the use and maintenance of the MK19, Mod3 Grenade Launcher.