I have a 223 wylde upper I impulse bought from them. It had to go back to get the feed ramps polished as it wouldn't feed. After a bunch of experimenting I cleaned it fully then ran one last mag or two through it to see if the last things i tried worked. Then I boxed it up without (foolishly on my part) cleaning it again. That last one I did was a full cleaning including scrubbing the inside of the upper, the lugs and chamber and running a rod and patches through the bore.
Initially they tried to tell me I could easily machine the ramps myself and they could give me pointers. I had to tell them I wanted it warrantied and lacked the time and tools for it, otherwise they wouldn't be hearing from me in the first place.
They worked on it and sent back and it works fine now but they also sent a snarky email about how filthy it was.
No, i did not make it spotless before I sent it in. Yes, that was my bad. No, it wasn't filthy with one mag through it after cleaning. And if filthiness is why it wouldn't shoot, clean it, shoot it and send it back to me without doing anything else. Bill me for return shipping. Don't do a bunch of machine work and then try to tell me lack of cleaning was the issue. If you did the warranty work then it was a warranty issue.
Their tone rubbed me the wrong way. I won't use them again although I hear of good experiences from others.
