Sounds good. Not common but my HRT g rail came with one. Gas port hole is drilled out, threaded, and a threaded Allen screw with a small hole is inserted. Built a middy for a buddy and I believe it’s giving him short stroke issues and I owe him a normal gas block.
I have one. I’d like to upgrade to a newer SBE that is optic rail ready, sell or trade. 12 ga, 24” barrel, set of chokes and a hevi shot Turkey choke as well. Pm if interested.