Remove a Weapon on CTF Map

[lord.deimos]

Is there a line you can add to the server.cfg file to remove certain weapons on a map? Or from the console once the map is running? I can listmodels from the console and have read about a remove entity command, but would like for certain weapons to be removed from gameplay. The main reason being I want to get rid of the dark matter gun on Xearo Gravity. Every time we play that map some loser starts spamming with it. Thanks!