I just read on another thread Grunt doesnt work on GRA Carbine.

Anyhow I wanted to ask on a related topic that does Laser Commander affect the new GRA weapons?

Sprtl Wood 9700,
MY HYPERBREEDER ALPHA,
GRA Laser pistol,
GRA tri-beam

If someone knows how to use Geck and can help, will be much appreciated.

The reason why Grunt doesn't work with GRA weapons is because the devs can't do cross dlc content for some reason. But seeing how laser commander is in the base game, there's no real reason why it shouldn't include GRA weapons. Having said that, there are still occasions where this is not true (the police pistol from DM isn't covered by Cowboy, for example).