Totally 3D printable rail accessory, mounts via two screws included in part files that screw into accessory and fit into rail slots (think most cheap vertical foregrips). Accessory is designed mainly to allow you to brace the rail against an object, a wall, some cover, etc; also kind of acts like a finger stop but not really the design intent.

Your mileage may vary on how strong the part is; with HIPS, the screw nub tends to break off first before the actual brace does (which is preferred, you can just keep a bunch of screws with you). Front texture isn't really designed to bite since it was intended to be made in plastic (actually it's cut off a bit for this purpose), main purpose is to give a small extension to the side of the rail to let you pivot the barrel around.

Print 2 screws for each rail brace. Some minor filing on the inside of the weaver rail mount may be helpful to get it to fit, it'll wear on though.

Keep a look out for a few more uploads using the same screw mount system!