Just purchased yo Dave's spring for my t3 lite 223. This appears to be a great trigger upgrade for the already great stock trigger. This spring works for any of the t3s. It brings trigger pull down to 12 to 20 ounces. Once installed on the lightest setting I did several drop tests with no issues. The trigger has no creep and has an extremely light pull. I recommend doing several dry fires to get used to it. I have not seen a lot on this trigger upgrade before before and I realize all it is a lighter spring but it seems to work very well. Just wanted to post it for any tikka owners looking for a bit lighter of a trigger pull.