Thanks for the reply guys!
I will try cocking it first, as Tom suggested. If it's still stuck in one piece, I will follow alanint's advice about Gun's and Ammo (I can actually purchase it in my local store here in norway also)
The pistol is pretty beaten up and worn out all over.. but the screws are actually not that bad
Edit;
I was so focused on removing the rear sight part backwards, I didn’t think of removing slide forwards while cocked! So easy that I'm a bit embarrassed
