No the switch is to be mounted on a rail only
Yes, the SureFire Scout Light Weapon Light Switch Assembly will work with the Micro Scout Weapon Light Pro M140.
It is pressure activation.
Yes, this should fit the M300c as well.
This is specifically for the “Scout” series
The SureFire Scout Light Weapon Light Switch Assembly w/Picatinny Pressure Pad will fit that light.
Yes, the SureFire Scout Light Weapon Light Switch Assembly is compatible with most SureFire's Scout Light WeaponLights (excludes Micro Scout Light Pro).
The SureFire Scout Light Weapon Light Switch Assembly w/Picatinny Pressure Pad is compatible with that light.
To mount the SureFire Scout Light Weapon Light Switch Assembly w/Picatinny Pressure Pad to an MLOK rail you will need an MLOK to picatinny adapter. The ones at the link below will work.
https://www.opticsplanet.com/leapers-utg-pro-m-lok-picatinny-rail-section-rejel.html
The 8 Slot UTG Pro M-LOK Picatinny Rail Section will work with the SureFire Scout Light Weapon Light Switch Assembly w/Picatinny Pressure Pad.