Interesting rifle and history. It's hard to be fully certain from the photos, but it sure looks like a L-46 Sako action. As noted by 2152hq, that's about all that is Sako. The L-46 is a nice little action. As for Micro-groove barrels, my only experience is in a .444 Marlin. Contrary to "general wisdom" it happily shoots cast bullets accurately and without leading. One data point and admitedly, not all that relevant to the .222.
I have three Sako L-46 rifles - all in .222 Remington. Two are the slender, magazine-fed sporters. The third one, like the subject of this thread is Sako in action only. It's an old benchrest gun. It has a solid floor single-shot action, with a heavy, stainless bull barrel all held in a laminated wood stock.
All three rifles are tack drivers, particularly the old bench gun. It's heavy enough and the .222's recoil is light enough that you can spot your own hits. Varmints in the scope turn to varmints in the dust in front of your eyes.
Yeah, you could say I'm a Sako fan.
