I had a bad experiance with Rock River Arms customer relations, turns out my local gun range could order dirrectly from them and take care of any issues that arose.
It all started when the green hand guards didn't match the green butstock, on my wifes AR-15, and we recieved a black pistol grip instead of green.
The quality of thier products is great, but don't hold you're breath waiting on a return phone call or Email.