ECN Forum Forums General Topics of the Trade General Discussion Area Multiwire (Edison) circuits and GFCI

You can install GFCI receptacles on any section of a multiwire circuit, but cannot use the feed through option.
Your multiwire circuit's grounded conductor should be pigtailed at each outlet any way.
Just install the GFCI receptacles individually.
You will need a separate GFCI receptacle for each location...S