If it's the same outfit out of E-Town, KY ... I have dealt with them.
I bought an AR-15 Upper from them at a local gun show last Spring.
After assembly and firing, a problem showed up in the rifling of the barrel.
I contacted Sporter Express, and James swapped out the upper for me without any issue.
Admiral Isoroku Yamamoto - “You cannot invade the mainland United States. There would be a rifle behind each blade of grass.”