If a supplier has an established GSA MAS (IT 70 - Services) and wants to add additional commercial items (Labor Categories) to a SIN, FAR 2.101 indicates that 'Of a type customarily used by the general public or by nongovernmental entities for purposes other than governmental purposes, and— (i) Has been sold, leased, or licensed to the general public; or (ii) Has been offered for sale, lease, or license to the general public.'
The Supplier can show commerciality through CID/CSP based on individual contracts with the Federal Government. Don't the offers/individual contracts with the Fed Gov fit the definition of a commercial item?