Originally Posted by jnc54
Ser # prefix is LG. It does have the Glock adj. site
Sometime in January/Febuary 1990, nice find especially with the rear adj sight.
Mines the same but 11/1989 (HP prefix) and has the Austrian proof marks.
Any other letter on the right side of the barrel besides the LGXXX?
If the internal parts are black you'll need the 6 part update.
Free from Glock or if you have a Glock armorer near you.
Here's some reading on the 6 part update.