Is it a drop in or requires fitment? The one video I saw online required filing of the Romeo 1 body. Anyone have do do the mod?

There should be not be any fitment required. I have one and I just took off the sight and slid it in the shroud and put it back on the pistol.

I am not sure of the video you are referencing but it took all of 2 minutes to install. Let me know if you have any questions.