I hope I don't sound too negative with this, but here goes:
I've held a few Stiga saws in my hands when I've been home in Norway on vacation. To me, and this is my opinion, nothing else, they are nothing but cheap clones made in China. Stiga isn't what it used to be, and it shows. Their saws feel cheap, and the use of cheap parts is everywhere. Maybe some parts will interchange with some of the Dolmar and Makita saws they are clones of, and that would be great!
To me it makes no sense they're using any real Dolmar/Makita parts. Think about a top end for a PS-5105, for example. It's $200.00. The whole Stiga saw is about $200.00. I know OEM pricing is different, but not that bad. Dolmar's cases were cast by Stihl, not by Dolmar, which adds another layer of expense to their saws. Stiga can't possibly have Stihl cast the cases and still keep the prices that low.
Look at the tank on the Stiga. It has that goofy built in scrench holder. Dolmar never did that, which to me means the tank is not a real Dolmar product.
To me this is just good business tactics by the Chinese. Clone a well built and simple saw, from a manufacturer that doesn't care anymore.
This is where all the Stiga stuff comes from:
https://www.aliexpress.us/item/3256801481863667.html?gatewayAdapt=glo2usa4itemAdapt&_randl_shipto=US
I could be wrong, though. I've been wrong many times before, and I'd be delighted if I was proven wrong on this one.