Top Dog,

I got it after watching this guys vids and seeing how well it worked for him (he builds his own):
https://www.youtube.com/channel/UCs3sYk1tuP5Er95EniC-uMw/videos

He's got a shop in Western Australia and fabricates the brakes there. Very well designed.

Amazingly, it's not as loud as I anticipated, tolerable for a big bore, really.

And no, the rear blast isn't bad at all.

I couldn't be happier with it.

Gary