It's date code stamped on the barrel, see related links for information on the Remington Society of America.
That Serail number dates the BAR to 1986.
It means the year 270 Anno Domini (In the Year of Our lord).
Post 81.
I can say that it was made sometime after 1991.That year ended with serial number G 2037985.
Yes, they have made many BARs in 270
The Winchester model 670,and 670 Magnum models were only made from 1967-1973.
270 days = 0.73973 ordinary calendar year 0.72770 calendar leap year 0.73924 earth orbital period
1 year = 12 months 270 months * (1 year/12 months) = 22.5 years Therefore, 270 months is 22 and a half years.
With the serial number that you have provided,your Winchester model 70 rifle was made in the year 1966.
Browning.com has sn data on their website listed under customer service.
Your serial number indicates that it was made in the year 1969.
You will have to provide the name of the company that made it. Even then, if data has not been published, the question can't be answered.