Magpul has their own pigment definitions for each color they own. What they call OD Green does not match the shade defined by the military and the open market. You would need to blend your own until you got an exact match to the set of Magpul furniture you have (different batches from Magpul can slightly vary). Only company that I'm aware of that licenses the use of Magpul's color pallet is Cerakote. And Cerakote isn't a paint that you can use to color fill with.http://www.cerakoteguncoatings.com/finishes/
Click there, and then select Green/Foliage. At the top you will see OD Green next to Magpul OD Green. Even from the sample pictures you can see with the naked eye there is a difference.