I've designed and built a couple of compensators used on AR's and hunting/competition rifles but with emphasis on recoil reduction and muzzle rise. I understand (mostly) the physics there. Do these diverters significantly reduce the blast over a conventional muzzle crown with no brake?
They add a little to recoil as the gas being pushed linear out the front natural exerts the gun back more. But I find the gun to run flatter than with the A2 flash hider/comp.
Now I reduced that with my adjustable gas block, lightened carrier and removed the weights from the buffer. Less reciprocating mass. Obviously do not do that with a full auto gun. But I can do .12 sec splits and it has run fine for a long time now.