Hi RF76,
My apologies if you already knew this. I find it interesting that your GRS Bifrost stock fits a Tikka T3x CTR, am I correct in that it is a CTR and not one of the other T3x models ?
I bought a new GRS stock about two weeks ago from OWH, sold for Tikka T3x rifles, for my Tikka T3x CTR (also in 308). I assumed it would fit my Tikka T3x CTR because it is sold for Tikka T3x rifles. However it did not fit.

My Tikka CTR was too wide for the slot in the GRS stock to slide into, by about 2 to 3 mm. I had to send the GRS stock back, bummer. OWH was

. It was only after this oopsie, that I found out the 'base' (magazine well ?) of the T3x CTR is wider than the other T3x models, that is why it did not fit. Optics Warehouse have since added a comment on their website to the GRS T3x stock, that it does not fit the T3x CTR. One has to get a stock from GRS made specifically for the T3x CTR, which I could not find in the UK at the time.
This is why I am curios as to how your Tikka T3x CTR fitted into your GRS stock, made for the Tikka T3x. I assume since your T3x CTR fits into this stock, other (non CTR) T3x models will not fit, or will be loose inside there. This is guessing on my part. Whichever way it is, it may be worth giving prospective buyers a heads-up to clarify their Tikka model is either a CTR, or not, just to be sure.
I gave up on getting a GRS stock, I ordered a much more expensive


MDT instead, fingers crossed it will fit. I am at the moment on a waiting list for it.