I'd back off on the firearms unless I was hunting. If you're hiking, one would be plenty-- if at all. Nothing political, I just don't feel all that threatened walking around the woods. If I was in Alaska in brown bear country, I'd feel real good with a shotgun handy.
A small PSK is really all you need-- a bit of stuff to take care of basic repairs and improvise with-- a little fishing gear and snare making stuff, extra fire making gear, back-up compass, signalling stuff.
You have a great first aid kit. I'm still divided on how much first aid gear to haul. I've gotten down to a pretty small kit and relying on improvised stuff like bandanas and socks for triangular bandages and compresses. I upped the duct tape to compensate. I carry some meds, tape, gauze, blister aids, regular bandaids, etc.
My PSK and first aid kit fit in a 5"x7"x2" pouch and weighs a pound. My "big" knife is a Fallkniven F1 and I have an SAK Classic and some razor blades in my PSK. If I really wanted to be equipped with cutters, I might add a Kershaw or Gerber folding saw. I would feel just fine with your RAT3. See
http://www.bladeforums.com/forums/showthread.php?t=496448 for my kit and photos.
The rest of my kit is ultralight hiking gear-- poncho shelter, sleeping bag and pad, water treament, cook kit, hygiene and toilet kit, three layers of clothing, hat, gloves, sunglasses, navigation gear, trekking poles, etc.
I always say "hike your own hike" so if you're young and strong enough to haul that stuff, go for it. I would trade off a little of the metal for more stuff to keep you warm, dry and comfortable. Great job on organization and packaging.