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There is an rod like attachment that hangs out the end of the barrel to keep the cartridge in place. Its long enough that the barrel has to be removed from the slide to remove the cartridge. I would leave the who thing together except the battery drains down in a couple of days just by being in the cartridge.Why did you have to disassemble the P226? My laser cart. just needs a pencil eraser or so
to push it out w/o disassembly