If you have an M2TS file (AVC+AC3), can you trim out a tiny chunk in the middle, then splice the two larger pieces back together, without re-encoding? If so, which tools could you use for this?

I'm very new to anything remotely video-related, so assume no knowledge of existing tools. The reason I'm asking is that if this can be done significantly more easily than re-encoding could be done, I would forgo the other possible edit which would definitely require re-encoding and just do this easy one.