I store my registration cert in there. I very carefully took it out the first time, then filed the square edges off the locking tabs at about a 45 degree angle, and not quite halfway down, leaving a smaller square edge on the tabs. This way if i squeeze it with my thumb and forefinger, while pulling on the plug with my other hand, it is reasonably accessible. It does get easier to open after a few time, and I'm sure you could make something like the MIAD core inserts to fit whatever you wanted to store in there. I personally keep a boresnake and Troy sight tool in the space in the butt though, and I'm not sure what else I will put in the grip after the registry is done. If you need pics, I could take some crappy ones with my phone