I wanted to switch my Nightingale back to semi-auto but misplaced the parts to do so. I modelled and printed these parts to replace the missing parts. I printed them out of PLA with relatively standard settings, if they break I'll update this model with the material I reprinted them out of. Depending on the tolerances of your printer (and mine) you might need to adjust the model.

The only hardware needed is the trigger itself (The part that wraps around the magazine) and a short m3 bolt or other 3mm rod.