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That part has nothing to do with the Systema PTWs, which is what this thread is about.
All of the Systema Switch Assemblies which (I'm assuming) you're referring to are all for version 2 gearboxes. The difference is in whether your gun is front (handguard/LAM) or rear powered (butt stock).
You don't *need* to buy the Systema M16 selector plate to use with the switch. Unless yours is broken or burnt out, there isn't a real need to replace it.
The Guarder one will work like the Systema one, but the wiring is just not the same low-resistance silicone wiring of the Systema one. It doesn't really make a difference until you go to extremely high power setups.
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