Get your choice of an AAC can and a 51t mount. they have a flash hider, muzzle brake, and a "brakeout" which is both a brake and a flash hider combined, but obviously it compromises both to meet in the middle.
I personally got a 7.62sd-n6 for my first can, so I can use it for everything .308 and under. I plan to add dedicated 5.56 cans later.