It uses the catch that is mounted behind the ejection port to lock into. Normally the guns do not have that catch but its placed there fore training to use the brass catcher or for guard duty when they have a red ejection port safety cover (think M3 Grease gun safety).
I can't pin down what you are pointing out. The two ears on the mag release seem to be in the same direction as every picture of a Swedish K I have seen. They do look like they were attached like shit though.
Congrats I have wanted one for a while but can no long afford to increase my collection. There was no accessories for it? On 1919A4.com there is a bunch of ZB27 accessories for sale.
Yes