No, the pins are not included.
According to the manufacturer: The S3G trigger has a very short, light pull and reset. We do not recommend it for duty use, bench rest, accuracy work or shooting small groups. It is designed for close course competition use where rapid target engagement with quick follow up shots are required.
According to the manufacturer: Please note, our triggers are designed for mil-spec AR15/M4 carbine rifles. Our AR15 triggers are not compatible with the Sig MPX/MCX weapons or Pistol Caliber Carbine AR15/M4 variants. Using them in these platforms will void the warranty. Please refer to our Super MCX SSA or Super MPX SSA if you are using these platforms.
This should work in any small-pin AR-15 lower receiver. You shouldn't need a heavier spring.
Yes, this will fit the CMMG Banshee MK10.
It will fit into any mil-spec AR-15 lower receiver. So yes, it will fit a Ruger AR15.