I'm starting my first OLL AR-15 build, and so far I've gotten the completed 18" mid-length gas system A4 upper from RRA, a U-15 stock, a couple 10-round mags, and a detachable A2 handle with sight.
Taking a good look at the end of the barrel, though, I'm wondering, is this what would be called a "flash hider", or is it a normal muzzle brake or compensator?

It's hard to tell, but the opening is cone-shaped, and there are five slots in a semi-circle from left to right over the top (none on the bottom). To be CA-legal-er, should I replace this with a "proper" muzzle brake or compensator?
Thanks!
Taking a good look at the end of the barrel, though, I'm wondering, is this what would be called a "flash hider", or is it a normal muzzle brake or compensator?
It's hard to tell, but the opening is cone-shaped, and there are five slots in a semi-circle from left to right over the top (none on the bottom). To be CA-legal-er, should I replace this with a "proper" muzzle brake or compensator?
Thanks!
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