Congrats on the purchase. Love the rifle and the caliber. [img]/ubbthreads/images/graemlins/grin.gif[/img]
The "III" on the receiver, is a action designation.
III is for 22-250, 243, 7mm-08, and .308.
My .300 Win mag is a V.
Is the rifle new? All new Sako's have the Key Concept, I believe. Mine did.
If it's unfired, maybe you have an older model. Or maybe someone else can elaborate on that.
As far as aftermarket add ons, I don't know if you need any.
That's the thing about the Sako 75, it's ready to roll out of the box!
What rings/scope mount are you going with??
Congrats again, and welcome to the Sako cult!! [img]/ubbthreads/images/graemlins/grin.gif[/img]...sakofan.. The web addy above should answer some questions for you too.