One of my rifles from them is based pretty close to that one. Working on developing my perfect reload for it now, but when I was shooting cheap boxed ammo, it did quite well. Not unhappy with the build at all.
Some downsides is it is very heavy. Specially for an AR15. It isn't going to be something you're going to be holding up to your shoulder. (Have 24" bull barrel on mine) If that is ok with you, as it was my intent for this gun for me, then you'll be happy.
The other downside is the length. I have a Magpul PRS stock on it, along with the 24" barrel (42" total), I'm not going to say I had issues finding a bag, but I think I was pretty lucky how well the first bag I picked up fit. You could possible have issues if you dont check sizes. (you do want a little extra spacing as well) I feel my 46" bag fits it nearly perfect.