I actually have two of these waiting on their stamps. I purchased them with the intent for dedicated hunting rifle use. OAL and weight were my two concerns, the SandmanK is fulfills those requirements.
One will almost exclusively live on a 16" 6.8spcII AR. The other one will bounce between a 6.5Grendel .308 and 7mmMag. The .308 and 7mm won't be hearing safe, but I'm hoping it takes the edge off for a shot or two. The 6.8 and 6.5 will be right near that 140 decibel range.
I have been able to shoot one of mine on a 10.5" 5.56 AR pistol w/ Echo trigger.. 60rds was a breeze for the silencer.