There are several 9mm suppressors that are modular and will work. For example, the Rugged Obsidian. Rugged sells universal direct thread mounts in a variety of threads. This is basically the end cap for the suppressor on the barrel side. Griffin Armament Revolution has the same set-up and the mounts are actually interchangeable (as stated above, the threading has become common across several manufacturers). That said, my vote would be for the 3-lug adapter and muzzle device, but that's also just swapping out the end cap / adapter on the same suppressor.