Barrel Cleaning

A dirty barrel clean affect your MTW’s performance. Garrett shows you how to keep it clean.

MTW-Spec Parts Compatibility

Parts/CompatibilityAEGReal SteelProprietary
Barrel NutMost, but not all.
Body Pins
Bolt CatchWith modification
Buffer Base Plate
Buffer Tube
Charging HandleWith modification
GripsWith modification
Hop Up
Inner Barrel
Outer Barrel
Selector Switch

Selector Switch Installation / Maintenance / Troubleshooting


If installing a new selector switch, please refer to this video for installation instructions. Please note this video is for electronics boards with a physical selector switch button. Please note the below instructions for boards using an optical sensor.

Optical Sensor

MTWs manufactured after October 1, 2021 are equipped with the black Spartan Electronics board with an optical select-fire sensor. This sensor works by detecting a dark or light surface on the selector barrel. Detecting a light surface will set the MTW to semi-auto and detecting a dark surface will set the MTW to full-auto.

A sticker or paint can be used to ensure that the two surfaces are detected correctly by the sensor.

Loose Selector Switch / Spring and Detent Replacement

Just like a real AR, the selector switch is held into each mode position by a spring and detent located in the lower receiver which will wear over time. The spring and detent can be replaced by removing the pistol grip.

Spartan Electronics for MTW-Spec Fire Modes

MTW Fire Mode Select Demonstration. See the instructions below for AEGs.

The Spartan Electronics board can be cycled through several different fire modes as listed below. To advance to the next fire mode, set your gun to semi mode and hold the trigger. After 5 seconds (MTW version) or 10 seconds (AEG Version), the board will advance to the next setting.

MTW (Hold 5 seconds to change modes)
• Semi / Full Auto (Default in US)
• Semi / 3-Round Burst
• Semi / 2-Round Burst
• Semi / Semi (Default in UK)
• 2-Round Burst / Full Auto

AEG (Hold 10 seconds to change modes)
• Semi / Full Auto (Default in US)
• Semi / 3-Round Burst
• Semi / Semi (Default in UK)

*Boards sold in Germany are locked in
Semi / Semi mode.