In your screenshot is the issue I'm talking about. The weapon is thinner than it should be.
When I run video in 4:3 stretched, all the sprites (weapons included, of course) look much more natural, at the cost of the level, plus its contents, being too wide.
https://cdn.discordapp.com/attachments/ ... /image.png
It's more obvious when you measure the revolver.
https://cdn.discordapp.com/attachments/ ... /image.png
And, of course, the scope.
https://cdn.discordapp.com/attachments/ ... /image.png