I brought home one of these type rifles today. It is my 1st rifle stronger than my old Remington 512 and Im looking to find out when this gun was made. It is identical to this one;

Ive been looking for a deer rifle and a friend put it up for sale.I didnt deal on the price due to her needing money.It was 150.00 total. The help Im needing is a site that can help me find more info on how to find the guns age.