The left leg looks blank on the second picture, besides the "Astro Magnum" version does have metal parts. I reckon this is a knockoff (one of all of those available), very interesting nonetheless as it's the first I see with plastic feet and thighs.
Yeah, this isn't Astro Magnum for the reasons Jose mentioned.
Also, AM's sound settings were "Thorp" and "Magnoid", weren't they?
I wonder what a "Bulcan" is.
Not sure if you can tell by the pic but this shockwave is a light gray one. I have also never heard the term bulcan. The battery cover says made in taiwan and battery/energy.