Picked this up from another forum and thought it was a pretty cool talking point. The data from the experiment is pretty cool, numbers might not be exact due to the process but does give some great comparisons. Especially the $16 Amazon.
http://www.thetruthaboutguns.com/2014/11/jeremy-s/556-muzzle-device-shootout/
http://www.thetruthaboutguns.com/2014/11/jeremy-s/556-muzzle-device-shootout/
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