I've done a significant amount of business with silenced america, they're a TX company. The owner (Scott) will make the process easy to understand and usually about a cheap as it gets.
They made the first one so easy for me I went back again. And again. And again. And then one more time.
More specifically, for your application would be well suited for an AAC SDN-6. Have one on the same rifle and it's AWESOME!
*I don't have any affiliation with that company, they're just good people that sell good products for a great price. Happy customer is all.*