About Weapons Factory by Niko
This Weapons factory has a plugin that allows weapons to be spawned and offered to the players with the correct card combinations. But its not that easy, guards patrol and they like to keep the rockets off the streets.
There is also a ramp leading upto a crusher so you can drive those unwanted cars into the factory and turn them into scrap.
The plugin is configured for rockets but the potential for customisation is available.