There are many modlets listed in that thread..if your link was meant to jump to the specific one.. sadly it doesn't, starts at top...OP, the munitions create would need to be modified via XML if you want it lockable. I created a modlet related to this. You can either download and use what I created or modify it to your liking. Enjoy!
https://community.7daystodie.com/topic/17240-modlet-laz-mans-modlets/?do=findComment&comment=348178