Slope Angle Factor Gauge

A Slope Angle Factor Gauge that attaches to a rifle and displays the Slope Angle Factor based on the elevation/depression angle of the firearm. It requires one (1) M4 nut, one (1) M4 washer, four (4) M6 nuts, four (4) M2x6 flat or pan head screws and two (2) M3x30 hex head screws.

The device attaches to the rifle via a Picatinny rail mount but has a dove-tail quick connect/disconnect.

• Layer height 0.15mm
• Infill 15% 
• Perimeters: 3
• Custom Supports (For Level Indicator)

Assembly:

1. Attach case_bottom to rail_dovetail using three (3) M2x6 screws. 
2. Place four (4) M6 nuts on bottom of level_indicator. 
3. Stack one (1) M4 washer and level_indicator on stem on case_bottom, with point on indicator facing away from case_bottom. 
4. Secure with one (1) M4 nut. (Leave nut just loose enough so that level_indicator swings easily when assembly is rotated from side to side.)
5. Carefully secure case_top to case_bottom with one (1) M2x6 screw. 
6. Attach rail assembly (rail_mount and rail_clip) to rifle using two (2) M3x30 screws.
   
7. Place gauge assembly onto rifle in dovetail slot.

Usage:

Indicator needle will move to slope angle factor based on angle of elevation/depression of firearm. Calculate range to target as the product of the displayed factor multiplied by the level range to target (range to target base at 0% angle, not the direct observed range). Adjust optic as required.

Target. Cease fire. 

Notes:

I just whipped this up quickly to get ready for hunting season. This is as small as I could make it and still make the numbers readable.

As I improve on the design to make it more durable (or smaller), I will post link here. 

Licensed under Creative Commons and OpenSCAD file is included if you need to make changes for your setup, but derivative distribution is not allowed.