Well from what I've learned when taming an argy is

That a trap works best for me captain fat dog's argy trap works best(captain fat dog is a youtubers if you didn't know) I usually use a crossbow and tranq arrows

But I've killed many high level argy cause the cross bow does way too much damage and not alot of torpor

So I use tranq darts and long neck and no wonder the tranq darts unlock on the same level as the argy saddle