ADCO does a great job with their flash hiders!
They did mine and it really turned out great. I love my Phantom 5C1.
Just be sure to note that if you have them "add" a bayonet lug, it will literally be added to your original FSB with the use of silver sodder. This makes it so that it cannot be used with a real bayonet. This really pissed me off since they do not show or say this on their website. If you want the real deal have them remove and totally replace the FSB.
Also with the Front Sight, they seemed to leave a little of what looked like rust, or some type of orange substance all round my FSB with where is connected with the barrel? Is it really rust or just some dried lubricant?
I totally recomend them for your Flash Hider though. They are an Ohio company and it is good to support your local buisness.