To clamp or or not to clamp...

Does anyone have any experience, thoughts on the A.R.M.S. #41-B folding sight/gas block combo? I really like the concept if for no other reason it appears familiar when deployed but I’m reluctant to remove a solidly pinned FSB for a clamp-on GB. In this instance I just want an uncluttered view when using optics, having irons as a secondary system. Maybe if they came out with a rail-friendly version I wouldn’t be adverse to shaving the FSB and adding the appropriate rail set-up. Any consensus regarding clamp-on GB’s?

Also, where would be a good source for “Rocksett”?