I've seen some 5.56 cans published as 131-133 dBs but never seen an independent review hit that low.

I can't tell the difference between 135-139 5.56 cans. I don't know why some people get so hung up on a few decibels but he catered right to them by focusing so much on them.

Disclaimer: I have recently ordered a 762 QDC so call me a fanboy if you must. I just looked at the available 7.62 cans and after having an Omega pushed down my throat did some research and chose otherwise.