Deathslingers default gun seems more accurate then his guns with skins.
Ive noticed that his guns with skins dont match up with his default gun when using the iron sights for aim. If you line up the top point of the iron sight with the top of a object, the shot will go above and not hit the object. Using his anniversary skin or another and line up the shot, it will hit the object. I dont know why the skins are not consistent with the default. I uploaded the video to Reddit