How to remove soft shadows around the hard voxel edges?

Hi. Could anyone help me out about these soft shadows I’m getting around the hard (blocky) edges on my gun? I’m sure this is just matter of shading options, probably just a few boxes to tick… However I was unable to find any solution to this problem. Attached is the screenshot of the issue I’m having:

Just to prove this looks absolutely disgusting in-game, here’s a screenshot of how it looks in play mode:

It does not look good and I’m trying to push for a more voxel-like look with hard shadows on the edges. Next attached is the example how I’d prefer the shadows to look (what I’m trying to achieve):

I don’t understand why the material preview shows different from what it looks in the game. Whoever has any ideas on how to resolve this issue I would seriously be beyond thankful. To whomever is reading this: have a nice rest of your day and thank you for taking your time to read my post! <3

not sure why the model viewer looks different then ingame, but… you just export the model with flat shading and it should look good. tested in 5.4 just now.

and it worked? soft edges gone? I’ve done the same thing and it remains smooth for some reason…