Description
SIG Sauer MPX-K Platform Selector Plate (M4-32-07-A01 – King Arms)
This King Arms selector plate is listed for the SIG Sauer MPX-K platform, with the part code M4-32-07-A01. In an AEG gearbox the selector plate moves with the fire selector and positions the trigger mechanism for safe, semi or full auto, so a worn or broken plate can cause problems selecting modes.
King Arms supplies many replacement parts for its own replicas. The M4 prefix in the code suggests an M4-style gearbox part, but please check it against your replica before ordering.
Using the part code
The listing gives the code M4-32-07-A01. Compare it with the parts diagram in your manual, or compare the plate with the one you are replacing, as selector plates differ between makers and gearbox versions.
Fitting
Replacing a selector plate means opening the gearbox on most AEGs. Take photos as you strip it down, keep the shims and small parts in order, and check that the selector moves cleanly between every position before closing the gearbox.
If you are not confident working on your replica, have the part fitted by an experienced technician. Keep small screws and springs in a tray while you work, and test the replica carefully with no BBs, gas or battery connected before using it in a game.
Key features
- King Arms replacement selector plate
- Part code M4-32-07-A01
- Listed for the SIG Sauer MPX-K platform
- Sets the trigger mechanism for each fire mode
Compatibility
Listed for King Arms’ SIG Sauer MPX-K platform. Check the code against your manual before ordering.
Spare parts are often specific to one manufacturer, and sometimes to one production version, so please compare this part with the one you are replacing, or contact us with your replica’s make and model, before ordering.
Care and maintenance
Lightly grease the selector plate’s sliding surfaces when the gearbox is open, and check for wear whenever you service the internals. Store spare parts dry.
Who is it for?
It is for MPX-K platform owners and technicians repairing a worn or broken selector plate.
Please note: Tools are not included.








