After years of debate (depending on who you ask) and edits it appears that the answer over who shot first has been answered. In a photo posted by ILM Visual Effects on twitter, Harrison Ford himself confirms that he shot first.
If this is official and recognized as canon by those in charge is yet to be determined but it sure appears that Han Solo shot first.
https://www.youtube.com/watch?v=v-xdepfah98
What do you think?
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- Mr. DAPs