These bullet inserts render 9mm cartridges inert and unable to be fired, perfect for replica display or training! 
Some assembly required, includes yellow plastic insert only.
Simply glue into a properly sized spent 9mm casing, it's as easy as that! The lower sides are relieved to allow for extra glue and to provide insurance against the ATF classifying it as an ammunition component.
These inserts occupy the entire interior volume of the casing so they're the perfect length every time!
They will give a COAL of about 28.5mm +/- 1mm, so they should work in all actions and magazines, and the tough ABS material holds up to repeated hard cycling.
 
BATFE Disclaimer: These inserts render a 9mm casing completely inert and unable to be fired even if loaded with a powder charge or primer. They are for display only.