You will have to call Browning.
There is no way to tell from just the serial number and no other information
You will have to call Browning.
You must call Browning to find out what grade it is.
Browning can tell you how it left the factory, and the gun can be dated by serial number.
By comparing it with known examples of the grades.
You will have to call Browning to find out.
What is the age of your browning 325 grade 6 serial number 16179NM?
Contact Browning or compare against known examples.
The 2 letters in your serial number(NR) indicate that your Browning 325 grade VI was made in the year 1997.
Call Browning with the serial number.
You will have to call Browning to find out.
You have not listed the entire sn. You will have to call Browning to find out.