You can get clones of the M9 on the open market with a variety of finishes. It's buyer beware on those. I only have examples of U.S. military contract M9's. The early ones came with a mat finish.
All the phrobis contract bayonets had that finish. The first Lan-Cay bayonets also had that finish. The specifications changed and the dark finish has been around more than 20 years now.
All the phrobis contract bayonets had that finish. The first Lan-Cay bayonets also had that finish. The specifications changed and the dark finish has been around more than 20 years now.