Illegal weapons as in a firearm or otherwise? My guess between 6 and 24 years per statute if its possession?
Conspiracy is punishable as well, even if you did not complete the actual offence. My guess probably 5 years or more.
Click on "Find a Lawyer" above and locate a criminal defense attorney in your area.
Click here for the NRA/ILA compendium of PR firearms laws:
https://www.nraila.org/articles/20080725/puerto-rico-firearms-laws