Originally Posted by
JohnnyC
It still is an SBR, the barrel is approx. 10" it's only the silencer tube that brings it to 16". Most of the 300BLK's with silencer are running similar lengths with either thread mounted or QD cans installed. An AAC 9" upper with a 762SDN-6 is only an inch shorter. If they had similar barrel lengths they would be the same size, only you have to put the AAC upper on a registered lower.
If the overall length is that important, you're not going to be running a silencer as all it does it put you into 16" length. For people who want a silenced 300BLK that's still handy, and still shorter than a non-NFA 556 gun with a silencer, and only one stamp, this is right up their alley.
The mass appeal is that this is a one stamp gun. The other offerings on the market require two. I'm not sure why you do not see the benefit in that considering the length issue is a wash.
And gunslinger, why would you want a Mk18 over this? The 300BLK was designed to eclipse the performance of 5.56mm SBR's, and it succeeds in doing so. A Mk18 with the as-issued KAC can is a similar length as this upper.