u/Hot-Brief7442

I've been lurking here for a while as my interest in SS has been growing rapidly. I've noticed many questions about compatibility, cutting, etc get repeated a lot and the information on the wiki is vague. Here are some general questions I have that will hopefully help myself and others:

1. What platforms currently have a known working SS? (AR, AK, MAC11, etc.) Can we rank these based on difficulty?

2. What options are available for each of these platforms? Don't need links or endorsements, but a list of known options would be nice if it doesn't break the rules.

3. Which option is cheapest, most reliable, plug and play vs needs effort to run, etc.

4. What is the real difference between a FRT and a SS?

5. What is needed to get a FRT (let's say AR) to work? Springs, barrel, specific type of receivers, etc.

6. Are there any fully DIY options? How difficult are they?

If anyone has additional input outside of these questions please feel free to share.

I'm cleaning up some wiring in my house and discovered two 12/3 wires between one switch and one light (no ground). I pulled the switch out and confirmed my suspicions that one of them is just unused back there, covered in tape.

Can/should I set up one of the conductors from the unused wiring as ground, or should I just pull it?