I just got a giga a couple of hours ago! I used crossbows with tranquilizer arrows to knock it out. I put it in a trap made out of metal. I used a 4x4 with door frames all around three walls high. I got the giga in the trap, then I started shooting it with tranquilizer arrows. It took around 150 tranquilizer arrows (it was a level 9) and took about 100 narcotics (I used a major soothing balm on it). I got it home and I am currently running around with it destroying everything.

More Giganotosaurus Taming & KO Tips