Thank you for using Blue Book, and Just Answer!
My name is ***** ***** I'll be glad to help you.
Back in a few minutes while I get my references.
1. Verify the serial number - are you sure the first letter is an "M" and not an "N"?
2. How long is the barrel?
3. Does the rear sight have a white outline?
4. How many screws do you see on the gun?