Last week Halo Reach received an update that “fixed” the view model positions for Centered Crosshair:
H2A MP needs a similar “fix” because most weapons take up a lot of screen space when playing with Centered Crosshair (You can see part of your left shoulder when using the Sniper Rifle). Halo 4 shares the same engine so it would be a good idea to share the view model positions because they work really well in Halo 4.
Here are some examples: