So a day late... I fired 3 boxs down range. the 1st couple mags no can, the rest with. While its not "hearing safe" it is noticable quieter. Like plugs or muffs not both quieter. it does change the balance of the gun, not bad with a full mag, but when it was almost empty you really notice it more. it was just me and the RO, let him put a few mags thru. He had that look " i need this". We all know that look

. i did not do any rapid fire, but it does get warm. i will have to bring some sd loads and see how the noise level compares. I think a db meter is in my future. I should brung the crono too to see if there is any change in mv. over all i am happy, lots of red tape, but not horrible. if you don't have one, i highly recomend one.