Handy link for Browning owners. I have two A-Bolts that I've managed to date to 2004 and 2007 respectively
First 5 numbers relate to where your firearm comes related to the overall number of firearms manufactured for that year. The two letters denote the year, and the last 3 refer to the model.
12345: 12345th rifle built of the year
MM: Built in 2000
2G7: A-Bolt Gold Medallion
Might be of interest to Browning owners