Macuahuitl. It's like a wooden club with two razor jagged obsidian edges. A good one in a competent user's hands could decapitate a horse with one swing. Am on my phone so picture later.
This is what mine would look like:
You can't really see how it works, though, so here are a couple of pictures to help get the idea across.
One of our combat arms instructors always had us repeat: "My weapon is my mind. My hands and tools are mere extensions of my will." If your mind is keen, you and everything around you is a weapon.
On that note I'd take:
- HK416 - front grip, EOtech holo sight, handguard mounted laser sight and designator
- HK USP .45
- SOG Tomahawk
- Cold Steel Recon 1 combat knife