After a fair bit of experimenting I have a working prototype
- Bullpup form factor
Electronic semi / auto selective fire
"Moah powah" was not a consideration, this design has a lot of faults and was built to learn from them. Issues I have right now include dead space between the valve and breech, lack of a propper detent to prevent rollout, plus a few other things.
The red-green LED is activated by the pressure switch in the butt plate; pull her in tight, green means single shot, loosen the grip a little and red means auto.
Any comments and advice appreciated.
Build photos are below: