Cavities on inside of buffer tube. - JE Machine Tech A2 .223/.308 Rifle Length Buffer Tube

Bought this and installed in a AR10 build. After first range trip, noticed a chunk of black metal in the trigger assembly,and the buffer had trouble cycling and would stick. It was catching on these pits/cavities in the tube. After removing the buffer, I noticed a large chunk of the inside of the buffer tube missing that had broken off. I emailed JE machine about this, they sent out a replacement. This one had even more cavities/pitting on the inside of the buffer tube. I emailed them again and told them to pick a good one to send me this time, this third one was still effected. I called/emailed again and they said turns out their whole inventory was effected in this was and it would be at least a month before the could send out a better tube. Thankfully, Optics planet refunded my purchase for the tube even though it was after the return date after I described what had happened.