Hey folks, I'm new to this site. Was wondering if I could tap into some of your expertise as the gentleman at glock said this is the place to go. I recently bought out a gun collection from a friend's dad who developed Alzheimer's. In the collection I came out with an early G17 serial prefix AH and Austrian proof marks. I was able to determine that the pistol was one of the 2nd thousand imported into the country but i wasn't sure if it had the original "pencil" bbl and weather or not it had the "safety" update in the ninety's. Any advice on determining this?