I often shoot unprotected out in the field, so I installed a blast deflector by Midwest Industries. Seems helping a bit. It may increase recoil a bit, but the recoil of 5.56 mm round is negligible, so it makes no difference.
I used to have an AK-74 compensator clone before. It was effective, but I could never prevent it from walking off. It has AK-style 14mm LH threads obviously, so it has to be install on an adapter. No matter what I did, the compensator would unscrew from the adapter. On a genuine AK, there's a set plunger in the base of the front sight. Another thing, which I forgot to account for, is the full-chamber design of it. Again, the plunger on AK allows a soldier to unscrew the compensator for cleaning easily. Not so if it's put on an adapter for AR or SU. I was glad to get rid of it, although it's a great design for its own application.