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The GM300 was Motorola's next step in the MaxTrac / Radius mobile product lines.

The M120 is just the limited version, not unlike the Maxtrac 50 compared with the Maxtrac 300. Includes model number information.

There are some Radius GM300 radios that are M100, M206, M208, M214, and M216 series. Includes model number information.

This procedure is for the purpose of adding more channels / modes to the GM300 radio. Including model number information.