I'm going to be ordering a peep sight for my Marlin 1894CSS soon and I'm torn between getting the Skinner Express and the Skinner Tactical (which has protective wings). I like the look of the express but I'm concerned about sturdiness. My question to skinner sight owners out there is this: is the exposed sight on the express rugged enough that a little banging around won't affect accuracy? Anyone have any trouble with the sight shifting? Thanks!