So here are my considerations for the one fighting long gun:
1. Reliability
2. Durability
3. Accuracy (out to 200 meters)
4. Easy maintenance
5. Magazine fed
6. Proven man killer
7. Weight
8. Availability of spare part
9. Availability of ammunition

While I love to pick a SCAR-16 or SCAR-17 for the ultimate fighting rifle, it would violate consideration #8. The only fighting long gun I would pick that meets all of my considerations is an AR-15 with an 18” barrel. The only ding on my list with the AR-15 is #4. I would forgo any sights in favor of straight iron sights.

As far as a hand gun, the Glock 17 is the only choice. No arguments allowed, my mind is made up, useless to challenge my decision, case closed. Unless…