wolverine sparten fcu for reference

thingiverse

The Wolverine Spartan Board features all crucial components clearly labeled. I'd say it's accurate within 0.3mm tolerances. The selector is positioned at a height where the switch won't be pressed down (fairly certain that means it's in semi-automatic mode). If you prefer it to always be depressed, it's roughly 1.5mm lower. Please note that this isn't a button, so if you want selective fire, you'll need a sliding tab that slides from front to back; the opposite configuration will damage the selector. Good luck with your project - hopefully, this saves you some time or lets you create something before investing in relatively expensive hardware.