We make a product called the "M4-SD Tactical compensator".
It reduces recoil and controls muzzle rise while continuing to permit attachment of several sound suppressor models and does so without increased blast and concussion to adjacent shooters on the firing line.
I have the PWS FSC556. FSC sands for Flash Suppressing Compensator. Night and day difference than a standard birdcage. Everyone who shot my AR wants one. Worth checking into. Oh yeah... and it looks bad @$$