HK VP9 Magazine Plug 15 to 10 Rounds

This thing is a plug for Heckler & Koch VP9 magazines intended to change 15 round magazines into 10 round capacity, for the purpose of making said magazines legal for New Jersey and other US states where semi-automatic pistol magazines are restricted to 10 rounds.

Installation should be simple, it's resigned to be drop-in - remove the base plate of the magazine, insert this plug into the bottom and reinstall the base plate. You will have to cut notches in the lower spring retainer (plastic)