UPDATE: I modified the body to be more sturdy without blocking too much of the inner workings.

Your RedDot is aiming at the sky instead of the target? And you cannot screw it down anymore? Need a few degrees more? Here comes the adjustable picantinny riser! And quick mountable too!

You need:

• 1x M3 x 50mm screw
• 1x M3 nut (or 3 if you want to use my optional quick_release_picantinny_rail_mount_hub_with_nut.stl)
• 1x 40x5mm spring
• 2x M3 x 35mm screw (40mm works as well)
• adjustable_picantinny_top.stl
• adjustable_picantinny_body.stl
• adjustable_picantinny_hub_short.stl OR
• adjustable_picantinny_hub_long.stl
• quick_release_picantinny_rail_mount_grip_medium.stl and from Quick release Picantinny Rail Mount
• quick_release_picantinny_rail_mount__level_left.stl
• quick_release_picantinny_rail_mount_lever_right.stl
• 2x quick_release_picantinny_rail_mount_hub.stl OR 2x quick_release_picantinny_rail_mount_with_hub.stl (provided by me)

Should i use the hub_short or the hub_long? Depends. Hub_short allows you to go all the way down to a zero degree angle. Hub_long gives you a little bit more angle.

3D printing: I went with PETG but it should work fine with PLA. Use 100% infill and support structures.

How to assemble: First, remove all support. There is some support in the middle of the hub, remove it carefully otherwise the M3 nut won't fit. Assemble the quick release levers and put the grip and the levers to the body. You can use the original quick_release_picantinny_rail_mount_hub.stl but i prefer my variant which comes equipped with an M3 nut.

Smooth the inner body and all moving parts. Make sure the top slides easily into the body. And the hub must run without much friction in the top and the body as well. Apply some oil.

Put the M3 x 50mm screw into the body and the spring over it. Put the M3 nut into the hub. Put the hub into the top. See picture 1. Now align the top with the body as in picture 2. Wobble gently until the top slides into the body at the front and the hub into the body at the back until they sit like in picture 3. It helps to compress the spring a little bit and move it upwards so it does not block the hub from sliding into the body. Then use a screwdriver to move the hub forward as in picture 4. Now start screwing the M3 x 50mm nut in. Block the hub from behind with the screwdriver so it does not slide back. When the screw has grabbed the nut continue to turn it and check the function. Move the hub back and forth by turning the screw. The screw should stay in place by the help of the spring. Voila!