For the record, Strad did do some machining on this and was left to debur the piece when he went home. He got some time turning the wheels on the lathe and mill. Part of my intentions with helping on this was to give back and help a novice, as I had machinist's (a couple were complete strangers) do for me when I didn't have the shop I do now. Hopefully this will inspire others to lend a hand in kindness to someone every now and then - it's not all about money. Strad and Shippy showed up with pizza and pop, and we had a good time of learning and productivity (I learned a lot about my new Mosin from operating on it's brother). No hammers contacted glass. Strad also gave me a really nice holster and mag pouch, and it will be much appreciated once the shorts come back out in the spring.
The brake is cold rolled mystery steel, since I didn't know Strad wanted stainless when I selected it from the drops pile. It's soft, doesn't cut nice enough to be leaded, and wouldn't give me a good finish no matter how slow I fed the cutter (I can usually get a good surface out of mild steel).
I turned it down to an inch since that's a good size for a brake.

We discussed how there's very little science indicated for brake design. There's no formula's for dissipation paths, volumes, and angles etc, so you pretty much pull a design out of your rear and see how it works. I'll be interested to hear how this one does at the range.
We could've done holes at an angle (even compound angles), but that would require moving the mill head (I have a super spacer, so radial holes would've been easy too) and I didn't feel like retramming the head over bubba.
Shippy's gun will go much faster, since we have a fixture to hold the receiver now. I also learned my steady rest won't go down to barrel diameter, so I need to make some new brass pads or build some roller rests for it.