How to mount the rail piece. If anyone wants one, please email me at cbocaj.L@gmail.com I have a few that I already made, and if there is enough demand, I will see if a local machine shop will make a batch for me. These are machined by me, and I am not a machinist so there are slight imperfections. They are solid aluminum with Alumahyde paint from Brownells. This is the rail piece of your choice, the screws, nuts, washers and spacers. You will need to purchase your own laser. You will also need to have 2.5mm and 3mm allen keys to install.