The mount I received is indeed canted and didn't exactly inspire much confidence initially... nevertheless, threw on my trusty TRS25 and headed to the range today. In practice I didn't notice the cant at all, mount felt sturdy and shooting with a red dot vice the iron sights is a godsend. Only issue I had was that after a couple hundred or so rounds the mounting block loosened up a bit, however I'll blame that on not torquing it especially tight and omitting the use of a thread lock, which has since been rectified. Safety was super hard to turn immediately after installing, but after shooting a bit, rotates smoothly like the original piece.
All in all I'm happy with it so far, I have a 1-4 optic on order and I'm curious to see how it performs compared to a red dot.
I thought about using a Bushnell 1-4 300blk reticle, heard it works well with x39.