I finally got the rifle finished, it was well worth the time and money invested. I like the way it turned out, it's a fun little rifle to shoot set up this way.
10 minutes of work will put it back to the original configuration, less than that to pull the front sight off the base and mount a scope if desired.
The rear sight is made by Unique, a French company that used to build target rifles.
I didn't find much on the 'net just by Googling the sight itself. A query on Rimfire Central turned up a gent that knew quite a bit of the history behind Unique.
It has 1/8 minute clicks, with a Gehmann adjustable iris. It looks to be really good quality, right up there with Anschutz or Walther IMO.
The front is an Anschutz 18mm globe, sitting on a custom made sight block, which in turn sits on a 21mm 1/2 - 28 UNEF thread protector from the good people at Nordic Marksman. Cathy at Nordic showed a lot of patience with what I'm sure seemed like an odd request for measurements. Great folks to deal with, I highly recommend them.
I wanted to be able to index the thread protector so that the flat I filed on it to mount the sight block was perfectly level. Rather than take a chance on screwing up the thread protector, I added a shim between the barrel and the thread protector, made from a 3/8" steel washer.
The washer was 0.070" thick to begin with, and I sanded it to 0.0675" thick to get the alignment perfect. If you do this, be aware that a half thou over or under the "ideal" size will result in poor alignment, with the front sight canted slightly instead of vertical. It's that sensitive! It took me three attempts to get it perfect.
I drilled and tapped two holes to mount the block to the thread protector, then used some blue Loctite 243 to secure the protector to the end of the barrel. It got tightened with a pair of vise grips padded with leather to avoid marring the finish. The shim, sight block, and top of the protector got cold blued before installation.
Another friend offered some clear front sight inserts, which I prefer, along with other bits and pieces.
It turned into a group effort to get this done!
The front sight is slightly ahead of the muzzle, but I don't mind the look. Plus with a 20" barrel, the Tikka already has a short sight radius. I may eventually build a custom threaded barrel extension, but this works well for now.
I've got a T3 Hunter stock on my T1x, as the last pic shows. Sight alignment is perfect for me, nice solid cheek weld, the comb height is ideal.
This makes a great working sporting rifle, even with CCI SV it's plenty accurate to hold the 10 ring on a 50m sporting rifle target.