I believe the latest T3 Tactical Model also uses the TRG Mags and comes Standard with a Threaded Barrel.
I did not know that about the mag.
Tikka T3 CTR
But yea, looking at the pics, that knob on the magazine is definitely there for the TRG. Hmmmm... I wonder if the mags will still be $150-200 with the CTR coming out??? That's a definite issue with the CTR if the mags are still TRG priced. I'm considering cutting a CTR down to replace my Ruger Scout.
But yea, Fireman, if you want anything but a prone rifle, I'd probably suggest you skip the AI or TRG. They're just too heavy to use as field guns for normal people, I mean there is probably some guy that can shoot from within 100y of his house that will tell you they're awesome for hunting, or the guy that hunts from his truck, but really, just no. There is a picture on Google images when you search TRG of a hunting dog sitting next to a BMW, a TRG leaning up against that, and a dead fox laying foreground... That to me represents the type of hunting "one simply does with the Sako rifle".
My recommendation would be the Tikka as well. You get all the cool guy features all the kids talk about here (60 degree bolt lift, Sako extractor... it's not a Remington), they're light, affordable, they're quite nice really. And, if you absolutely must have a tactical looking gun you can replace the stock with an AI AT chassis, or more apt for that gun the KRG W3C and if light is still a concern, the KRG Xray, among others (Roedale is ligher and cheaper than AI, uses ViperSkins). You have options, just not 700-style options.
I'd have a Tikka as my go-to right now if I didn't have a smoking deal on a Defiance action being built up.
I've seen your posts on other forums, I'm pretty sure the Tikka is for you.
The issues I know of with the Tikka, are that the long actions will likely never take AI mags. The short actions will with a stock/chassis change, but it'll likely not happen for long actions. There is talk about someone making a new mag, but that has issues in itself. The other issue with Tikka is BERETTA. They're assholes about importing what you want - no matter what you want. If you can get the Tikka you want at gun store or EuroOptic or whoever, go for it, but if you can only find what you want on Tikka's Finnish site, good luck with that!