I have seen a couple of people asking how to return the Nexus 7 to stock after it has been unlocked, rooted and so on, so I figured I would write a quick guide as its super easy to do. Also, please make sure you make a backup of anything you don't want to lose. This is important.
Before you begin, please make sure you have ADB and Fastboot drivers installed and working.
1) Download the factory image for the Nexus 7 at https://dl.google.com/dl/android/aos...y-d341d356.tgz
2) Extract the factory image into the same directory as your ADB and Fastboot executibles (e.g. "\android-sdk\platform-tools")
3) Plug in your device. If you are booted into Android, open a command prompt to your ADB and Fastboot directory, then type
adb reboot bootloader
fastboot flash bootloader bootloader-grouper-4.23.img
fastboot -w update image-nakasi-jwr66v.zip
fastboot oem lock
Additionally, here is an instructional video courtesy of XDA user SladeNoctis.
Also, thank you to XDA user Shano56 for the formatting help on this post.