I have owned several Spanish guns, and I used three Spanish guns extensively: AYA No 2 and No 4 and an Arrietta 16 ga sidelock 572 model, I believe. I never had any mechanical issues with any of them. But both sets of the AYA barrels diverged their patterns. The No 2's left barrel shot to the left by 8 inches compared to the right barrel. The No 4 was a true left hand gun. The left barrel shot to point of aim but the right barrel shot low and right. The Arrietta's barrels shot together but low and the stock was very high already. I traded the Arrietta for an English SA Leonard sidelock. I used that gun successfully for several years until I obtained my current left hand pair. I would not buy another Spanish gun except to resell.