Hiperfire makes no mention of rimfire caliber AR's and makes little mention of compatible platforms for this trigger. I would recommend reaching out to them directly to verify whether they have tested that combination.
Unfortunately this will not work properly in the S&W M&P 15-22.
Yes, this is an excellent trigger and should work very well in your .300 AAC Anderson AR-15.
The HIPERFIRE HIPERTOUCH ECLipse AR Fire-Control Group will not work in a B&T APC223.
The HIPERFIRE HIPERTOUCH ECLipse AR Fire-Control Group will work in a Sig Sauer 716i Tread.
We do not have the individual springs for the HIPERFIRE HIPERTOUCH ECLipse AR Fire-Control Group. I recommend contacting Hiperfire for an extra set of springs.
Yes, this trigger would work in the AR-9.
Yes, this will work in an AR-9.
Yes, it will.
Yes, they should be compatible.