So, just to get it together, I slapped that .30-cal Ruger muzzle device on there - had that thing left over from the GSR. The real muzzle device wasn't in yet. However, it is here today...
I went with the AAC Single Chamber Brake. Might sound odd, but that was all planned out. It only adds a little more than 1" to the barrel OAL, and I wanted to keep this thing short. If it's going to be a truck gun, then it's a good thing it's not 37" long, OAL. So, short was the key. Also, using a brake might sound crazy - but I don't want the front of this thing moving under recoil. Keep it flat, keep it on target. I don't care how loud it might be - not if it ever gets used for it's intended purpose. Loud = Don't Care.
We'll see how loud it is in the morning...