I can't seem to find KAK in the industry forum where I would like to complain, but I recently bought KAK tube for the Shockwave brace and it is significantly out of spec. I have it measured at 1.261" at the skinniest, several places along the tube it's over 1.27" with a caliper. According to shockwave the tube diameter needs to be less than 1.25".

Thankfully I have an old PSA tube it will fit on for opening deer hunting on Saturday some how I doubt KAK or Shockwave where I bought the tube is going to overnight me a tube that is actually built to spec.

I had the same issue 3 weeks ago and I responded to a review email they sent me. I let them know it was no big deal and was just going to sand the tube a bit and BOOM, I had a new tube, no questions asked in 2 days in the mailbox. Nor did I have to return the out of spec tube.
Excellent service.
Just email them [email protected]

FWIW, their KAK tube with the blade is nothing short of amazing.. And only $20. I've seen people that use blades on standard tubes and crack them (the blade).