The Grove weapons are altered by the game scripts when CJ sprays all the tags. After that the gang weapons are not changed.
The Savegame Editor v3.1.2 includes a gang weapon tool if you want to experiment without using codes.http://www.paulinternet.nl/?page=sa
CLEO scripts can be a very easy way to make minor or major changes to your game, and will work on existing saves. It's worth looking in to.
Note: A smaller image wouldn't mess with my page width so much. This post has been edited by OrionSR on Tuesday, Jul 31 2012, 00:34