I think it should be the same. Selling to the government is the same as retail sales. For a non-government contract, it would depend on what your customer is doing with the goods. If they are buying the goods for their own use, that's a retail sale. If they are reselling the goods, you are a wholesaler.
Don't spend a lot of time or energy worrying about the business code. It doesn't affect your tax. The IRS uses it mainly for statistical purposes.
I notice that in your original question you said that you are the only member of the LLC "at this moment." If you add other members the LLC becomes a partnership for tax purposes. That means it is a different business entity, and it involves a lot of other tax considerations. If you add other members you should consult a local tax professional for guidance.
