Replacement Top (battery) cover of your box drive. All Gen2 Box Drive magazine will come with these plates already installed. You still have the same load count of 140-150 rounds with this plate installed.
If you want the Gen1 plate, it is available FREE here https://mcsus.com/products/box-magazine-plate
Q: How do I remove the top plate to replace the battery? Do I simply pry it off after removing the single Phillips-head screw? I really don’t want to break it.
A: Here is the service video https://mcsus.com/blogs/tech-videos/mcs-gen2-box-magazine-cleaning-programing-and-shooting