I agree there are a number of ways this could have been fixed and all of them a better way then this. But Looking at it as this is their "cheap" gun and most likely they have a surplus of the old spring they must have felt that chopping the old spring and adding a "off the shelf" spring behind it was the fast and cheap fix. Maybe it will change again. Maybe this was a temp fix until a better way was made that still was not expensive.
Who knows.
If I do end up with misfires still I think I'll laser cut a few shims and adjust the pre-load pressure. I really do think that removing the burs will fix it. Though the side pressure caused by the 3 piece spring will cause premature wear on the pin and bolt.