Gold E:
I have one of each - a RAD II and a Bump Buster.
Tom Larkin installed the RAD on my single barrel five or six years ago. Ken Rucker put the Bump Buster on my doubles gun at this year's Grand. Both of these gentlemen do top notch work and both units work well.
If I were to install another reducer tomorrow, it would be another Bump Buster. There are two reasons.
1. The length of pull adjustment on the RAD is limited to 1/8" incremental steps. Changes are made by tightening steel set screws into shallow holes in the RAD's aluminum body. Over time, I have done some damage to the adjustment holes. I have seen other RAD's with similar or worse damage.
The LOP adjustment on the Bump Buster is much finer and IMHO more durable.
2. Both units allow the recoil pad to be adjusted up, down, left or right. The Bump Buster's pad adjuster is by far easier to work with.
I'm not sure I understand Jake's comment. A moving comb isn't part the installation on my RAD or my Bump Buster.
Buttermilk