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Four years later, Alec Baldwin still isn't completely out of the woods with regard to the tragic shooting on the set of his movie "Rust" ... the gun supplier from the movie is now suing Alec and several others, claiming they smeared his good name after the fatal incident.

In court documents, obtained by TMZ, Seth Kenney -- the owner of PDQ Arm & Prop who filed the suit without a lawyer -- alleges his reputation was tarnished due to "cutthroat industry Hollywood 'fixers' and media," which led to "significant loss of past, present and future financial income." Getty

He claims Alec and others -- including Halyna Hutchins ' widower, Matthew -- "conspired to paint [him] in a nationwide false light scapegoat smear campaign" to distance themselves from the "Rust"

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