I have a Witt Machine Co brake on my shilen barrel in .308 and it's fantastic. It's a clamp on brake, but I have to tell you, I never regretted purchasing it. I too have had shoulder surgery and presently have 6 anchors holding everything together, yet I can fire this rifle all day as the recoil is as light as a .223. I'm shooting 168g SMK's at 2880 f/sec, and it feels like a 5.56. You can't go wrong with a clamp on in my opinion.