Cables for rear surrounds

+1 reubent -- and to amplify his recommendation, BFA-style banana plugs are different from the banana plugs you usually think of. They have considerably better contact area and the tension of them is easy to adjust so that you get a close fit.
Even inexpensive ones like these should work well in your application.
https://www.amazon.com/KnuKonceptz-eKs-Style-Banana-Plugs/dp/B008D2TC4M/ref=sr_1_fkmr0_3?ie=UTF8&...

suncore,

If you have the ability to solder, you might want to try these:

https://www.dysonaudio.com/products/new-dyson-audio-24k-beryllium-copper-low-mass-bfa-z-plug-bananas...

I've used similar, and they are awesome! Nordost Z-plugs are essentially the same as these and they are used on multi-thousand dollar speaker cables.

I'll third, or fourth, the BFA banana plugs suggestion. They are superior in sound quality and connection to spades and old style bananas as well as bare wire. Well, in my experience at least

I don't know the answer, I'm just asking: Is 16g enough wire for a 50' run, or should suncore consider 14g, or even 12g?

Hey bdp24 good observation -  never occurred to me that 16 gauge may not be good for 50' run of cable. Anyone think 14g would be better?