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The muzzle blast comes from when the hot gases from the barrel comes into contact with the relatively speaking cold ambient air, creating sound and shockwaves. The CRD allegedly "funnels" the shockwave away from the shooter, which could prevent headache due to "blast" after a long day on the range.

No, not a suppressor. Each manufacturer seem to call them by different names, i.e. Blast Shield, Concussion Diverter, Blast Diffuser, etc. It doesn’t suppress the sound measured forward nor directly to the side of the muzzle, and as such is not regarded as a suppressor by the ATF. Apparently it ...

Has anyone tested using a Concussion Reduction Device, and did it help reduce concussion from the muzzle blast?