Bad finish and stock wobble - Primary Weapons Systems PWS Enhanced Buffer Tube, Mil-Spec Gen 2 Ratchet Lock Endplate

Decided to upgrade the buffer tube on my AR15. When I received the product, the finish on the castle nut did not match the the rest of the pieces. After I decided to let that slide I installed the product and found there was a lot of wobble when the stock was full collapsed. I usually run the stock completely collapsed because I run an ACOG with limited eye relief. For reference I have a Magpul ACS stock, not sure if that matters. I was very disappointed with my purchase, the standard mil-spec buffer tube that I replaced was a much tighter fit.