This is a red dot sight to be used for any launcher with slow moving projectiles that require a high angle of aim like nerf, 37mm, or 26.5mm.  It has preset notches at 5 degree increments from 0 to 35 degrees.  It fits a Shield RMSC mounting plate because I found a cheap red dot for $60 on amazon with that footprint. I will note that works really well, but this is version one.  Version two will reduce the radius, make it more compact and hopefully make the risers much stronger.  However, no clue when I get around to finishing that so I am posting this now.  The smallest piece, the one that indicates what angle it is set at must fit within the other piece.  I have two printers, when I print on one it fits fine but on the other I have to scale it to 98 percent.  And sanding pieces with fine grit sandpaper and using the same lubrication you use on your printer rails makes it much smoother.  Sanding is definitely needed on the pegs for the red dot mount.  Unfortunately, this part needs to be printed vertically, otherwise no sanding would be necessary but minimal sanding on the sides of the pegs makes it fit quite easily.

I used m5 socket heads for the pic rail mount, and an m4-35mm socket head for the front hinge.  For the red dot mount, thin (1.8mm thin) square nuts are needed and m3-8mm button heads are optimal for the red dot but socket heads are pictured because that's all I had on hand.  The spring was a 6mm OD spring that I cut to length depending on how stiff it feels.

Red dot on amazon:

[https://www.amazon.com/dp/B0FHKH9XQT?ref=ppx_yo2ov_dt_b_fed_asin_title](https://www.amazon.com/dp/B0FHKH9XQT?ref=ppx_yo2ov_dt_b_fed_asin_title)

Square nuts on amazon:

[https://www.amazon.com/dp/B0D6SP881V?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1](https://www.amazon.com/dp/B0D6SP881V?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1)