In September of last year Steyr posted a recall notice on their 9mm A1 series of pistols. I know I’m posting this fairly late, but this website wasn’t live back then. Check the link or the image below to see if your serial number matches the range in the recall. Instructions are included if you are “lucky” enough to get a free upgrade.
I’m fairly certain this recall was for guns produced after the new type of trigger was introduced.