Thank you for that link, afi1! I had heard of new RSAs but didn't have the info and phone number. Guess I'll call the number and get the new RSA for my 23Gen4.
Haven't had any trouble but if they have a better one why not. I think the bulk of the problems have been with the 17 and 19 Gen4s. At first Glock used the same RSA for 9mm and 40S&W. But the part has also changed for the 40 so it's worth getting.
ETA: Hmmm, I see they want you to return your original RSA. Guess we've got to do a lot of test firing before sending off an old unit that works. I'm not going to be in a hurry to send it back.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek