I'll pile on here too. I have a Tikka T3 TAC in .300 WM that shoots factory ammunition into a little over 5-shot 1/2" groups and I saw no significant change after upgrading the trigger guard, bolt shroud, recoil lug and magazines with Mountain Tactical parts. That rifle has dropped three elk and one deer and like others have said, the upgrades were more about aesthetics with parts commensurate with the overall quality of the rifle.
I have two Sako S20s and am now convinced that Sako/Tikka make the best production rifles available. If they'd only increase the .30 cal twist rates I wouldn't even look at another manufacturer. As it is, I'm barely looking at other manufacturers any more.
