S.L.A.M not working?

So I have Half life 2, TF2, and Portal…and yet, in Gmod, I press P, or use impulse 101, and get every weapon and they all work, but S.L.A.M doesn’t…
I get it, but It only has 3 ammo, and there pink and black checkerboard, and it doesn’t have the remote thing to detonate them. And if that isn’t enough, I have to shoot them to make em’ explode, and 3 ammo is the most I can get, despite pressing P…What do I do, I don’t need CSS for a HL2 mod do I?

Install HL2DM.

You detonate them by secondary firing them. Or pressing E.

You need HL2DM for the SLAM to work correctly. It’s free depending on your graphics card

If ATI: http://www.steampowered.com/ati_offer1a/
If nVidia: http://www.steampowered.com/nvidia/ (ignore the Portal thing)
If Intel: why the fuck are you running GMod on an Intel GPU?