I didn't actually have an issue. I mearly had a conversation with them regarding their barrel tenon length and the chamber that they chose. The problem is with me moreso than them if I'm honest. I have troublshot and built a lot of CZ 455's and 457's. I've been able to get them all to shoot tiny groups. Part of my success has been due to some experiments with headspace. When they told me that their tenon length on their drop-in CZ barrels is 1.189" and that they didn't see a necessity for a longer length tenon and shims for custom setting the headspace, I lost respect. Their response was literally something like.."the good news is that we are within SAAMI specs". Sure, that's great from a safety standpoint, but based on their tenon length, the 2 457 actions that I have here would end up with headspace of .046" and .047"! While those are SAAMI safe, they are not optimal for accuracy. Ever wonder what Vudoo means by "they designed their chamber for Lapua ammo"? Aside from other dimensions, Lapua ammo has a rim thickness of .043", which is the tightest allowable SAAMI headspace dimension. I'd bet dollars to donuts that headspace on a Vudoo is .043" or .044" to keep them in safety spec while at the same time taking advantage of the thicker Lapua rim thickness for better accuracy.
My last concern was which chamber they were using. When they condeceningly scoffed at my headspace concerns, I asked which chamber they were using and remarked that I hoped it wasn't a Bentz. They never replied. I found out recently that it is a Bentz.
While this may seem trivial to some, it's not when you're trying to get the most accuracy possible. Headspace is tuneable for your choice of ammo, and a Bentz chamber leaves accuracy on the table compared to most every other match chamber.
All that aside, I was very surprised at the attitude of the person I delt with. Their reputation had led me to believe that a drop-in CZ barrel made by them would be of the highest quality. In reality, they are traveling a road pioneered and abandoned by Lilja a couple of years ago. As far as I know Lilja is the only maker of drop-in CZ barrels that is shimmable. They have also abandoned the Bentz chamber for a more match quality one called the Lilja 2.