How to tame an Argy:

Build a trap. You will need a stone foundation, stone doorframe (or fence posts), a stone hatch door, and stone fences. Build a two high tower with doorframes, then one on either side of the trap. Make sure you have space to get out!!! Seal those with a hatch ceiling on top, and stone fence supports on the sides. Now just lead the Argy to the trap. They are territorial so if you encroach too far on their space they will aggro. I recommend waiting for one to land to be safe. Make sure to lead the argy to your trap via the TWO-HIGH doorframes. It won't fit through the one highs and so will go around. Trust me, I know. Once its trapped, just tranq it up. If it escapes the trap, don't panic. Just hit it before it gets too high out of range. If you die, or your trap fails completely, that's okay. Just keep trying and make sure you have a base next to your trap for easy stuff retrieval after death.