For those willing to buck Rokslide norms a bit, Seekins now has the 22 ARC available in the PH3, Element M3, and Element Hunter. EuroOptic quoted me ~60 days for fulfillment and delivery. 22CM was also announced but is behind the 22 ARC in the production queue and was more of a December/January time frame. Seekins is also selling 20" prefits ($525) and bolt heads ($125) on Europtic for the new PH3/M3 actions.
I've been running the new Element M3 action (6CM) in my Slam chassis. I've been running it pretty hard now for about 4 months and have been impressed. The new lug and bolt design, combined with them ditching the internal action coating they were previously using, results in a MUCH smoother action than the PH2/M2. The modularity of the platform is also quite cool, specifically the quick detach barrel system. It doesn't result in anything that you can't already get from your Tikka, but instead of needing the force of God to get your barrel off (as with your Tikka), it can be twisted off with your hands after loosening the barrel collar. I've taken my barrel off and on a few times just to test things out. It can be done in just a few minutes with nothing more than a torque head driver and it has had zero impact on my point of impact and accurarcy. The gun continues to hammer regardless how much I fiddle with the barrel detach system

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I just ordered a 22 ARC prefit, ARC bolt head, and ARC magazine for under $700 off EuroOptic and and will be bouncing between 22 ARC and 6CM for the next year or so depending on the use case. Don't want to sound like too much of a Seekins fanboy as I do love my Tikka 223.. But I'm quite impressed with what Seekins has cooking up with the PH3/M3.