Pinned action..? The barrels are threaded to the action on a Tikka. Savage and Remington use plastic stocks as well, the Tikka's plastic stock is as stiff as Savage's accustock. Take a look down a Savage or Remington barrel with a bore scope and compare that to a Tikka barrel, night and day difference. Tikka rifles are built to very strict tolerances in a very economical and efficient manner, hence the use of plastics and one length of receiver and trigger guard. The Tikka also has one of the best triggers I've ever pulled on a rifle, let alone a factory rifle. I have the trigger on my Tikka set at 1 lb and I can not set it off by aggressively slamming the bolt or bouncing the butt end on the ground. You can purchase a Tikka varmint for around $1000 and have accuracy that mimics the Sako TRG at 1/3 the price.
I agree. I have a Tikka T3 Varmint in .308 - Awesome Rifle!