Magnusson device broken?

I’m unsure if my install of Gmod13 is in any way broken, but to my knowledge I have only installed maps. I was trying to build a contraption using the magnusson device, but it works only as a model, it doesn’t attach to striders in any way and doesn’t explode with its glorious particle effects if I shoot it, or hit it into the ground with the gravity gun. I have ep2 mounted, along HL2, E1, CSS, DOD, TF2 and Portal.

Has anyone else noticed this? I haven’t used it prior to Gmod13, so maybe it just never worked?