Finally, I got an Astra 900 and went to the range two days ago. Fired 100 rounds at a 1ft x 1ft target paper from 10 yards. It worked almost flawlessly. 80 rounds were fired single hand. Initially, I could hit the middle black circle easily (diameter roughly 7cm), but performance dropped along the way because my arm was tired holding this heavy pistol
The last 20 rounds were fired with a stock attached. Jammed once at the 98th round, easily cleared, no other issues. First time shooting an Astra 900, it's wonderful experience.