No, not one on one.
We know that Securitymechs exist: Industrialmechs built to perform crowd control and low-intensity urban suppression. We've got a few canon configurations in various sourcebooks, like TRO Vehicle Annex.
We also know that there are variants of actual Battlemechs built for the same duty, like the Urbanmech that showed up in Illusion of Victory: it had its small lasers replaced with a water cannon.
So my question is this: given the choice, which one would you purchase to protect your non-vital facilities?