I've attached a couple of drawings that show the different types of Sight shields in use on the USMC LAV25. Something to remember is that the ballistic covers are just that covers and they can be moved from one sight to the other without too much trouble.
This cover style was used on the initial LAV’s through the first Gulf War.

This second style cover appeared at the end of the first Gulf war and covered the Gunners side only, the commanders side didn't change from the cover above.

Now, with the latest upgrades, the cover from the image above is being moved to the commanders side and the gunner is getting a system that looks like this from the outside. This is a post OIF modification

As I stated in an earlier post the SLEP program completed about two years ago, and almost immediately new upgrades were being applied that made the LAV even better, but necessitated that some of the SLEP mods be removed. I hope this helps.
Tanks Out