Just an update that includes a few upgrades. I decided to make an insert that holds the CR2032 batteries that most red dots that may be installed on shotguns use. The Holosun HS510C, Trijicon RMR, SRO, RMRHD, Aimpoint ACRO, Vortex Defender and many more use the CR2032 batteries. And to make it easier to remove the battery, It will come with a pull tab to help pull the battery out. It will hold two of the CR2032 batteries. This works with all models of the MTUBSC. Here are a few of the pics of it under development and the current version. If anyone has any questions or would like to see a feature added please hit me up.