I bought one of these off Tikka Tinker and I'm happy with it. I only stripped one screw getting the stock rail off, and his replacement dropped right in perfectly. He even included a spare screw, which is great because I have a habit of losing small stuff in my workshop. It sits a tiny bit higher than the stock rail, but gave my Vortex PST Gen II enough clearance on Steiner extra high rings that my scope caps fit with just under 1/8" of space to spare.I am selling the remainder of the 20 MOA rails I have left. $240 shipped to lower 48. Send me a PM if interested.
Note: these will only fit the TAC A1 model.
Overall there are cheaper options for the T3X line, but I haven't seen anything made for the Tac A1 specifically. If you're like me and not a fan of how one piece mounts look on bolt guns, this is pretty much your only option for the Tac A1. I'm very happy with it.