JR,
I did a little research after I posted (should have done it before I posted!). Looks like the AT stands for Austria. Means the barrel was made in Austria. The Pentagon refers to the grade of steel used. At least this is what the majority of the searches I've done turn up. It does not have the proof mark on the slide.
I did a little research after I posted (should have done it before I posted!). Looks like the AT stands for Austria. Means the barrel was made in Austria. The Pentagon refers to the grade of steel used. At least this is what the majority of the searches I've done turn up. It does not have the proof mark on the slide.
