I have a surefire pro comp muzzle brake and an archangel ar10 extended latch charge handle for sale. It is the right handed model.
https://www.midwayusa.com/product/1016545425. This is the muzzle brake.
They both are in original box. The muzzle brake has some marks on it where someone removed it from the ar10. I can send pics to interested parties.
$85 shipped for both.