For a while now, when playing first person shooters, one thing has always bugged me, the weapon that blocks the view, and the metal ring or square around the crosshair.
Here is a random image I found on google showing an ACOG scope http://images.wikia.com/callofduty/images/9/99/Aiming_down_the_ACOG_Scope_CODG.png, what do you notice? I for instance am bugged by it, simply because the metal ring blocks a few percent of the view. Another image here showing the main body of the PP-2000 from BF3 and how it blocks a lot from the view http://www.imfdb.org/images/thumb/e/ec/Bf3_pp-2000_aim.jpg/600px-Bf3_pp-2000_aim.jpg
Now what else do you see? Yes, the body of the weapon with the hand holding it, that blocks a significant amount of view in front of you, so much that it will hide an enemy if he is slightly farther away and below you. Has happened to me.
This is pretty much an issue with every shooter out there that has an aim down feature of the weapon(s). How do you propose this gets fixed, but maintains a feel of realism?