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Maybe its guys imitating the stance but not holding it exactly like Costa. Costa has a more straight left arm and right arm (he's a righty I think) more tucked in.
Some people copying his modern isosceles stance holds the rifle a little further back, allowing left arm to chicken wing out a bit. I've seen ones where they hold a little high too whereas Costa's left hand is more level to the barrel so you don't block peripheral vision. And their right dominant hand also wings out a bit too whereas Costa is more tucked in.
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