It is a.308, and it looks like a XCR, only it is black. Related Post: Best Remington 700 Chassis. Please leave a comment and tell us if Remington 700 serial number lookup worked well and helped you find out the date when your Remington 700 rifle was manufactured. Rem 700 serial number to manufacture date, remington 700 bdl date of manufacture. The serial number on the barrel (barrel code) is D6227819. From all I can find.without the barrel date codes you can not date a Rem 700 reciever.? JC Remington Dates of Manufacture. They resumed stamping the date code on the barrel on 10/1/01. They continued to mark the date code on the end flap of the shipping box. On 8/9/99, stopped stamping the barrels with the date code. Proof mark is usually surrounded by an oval. There are also symbols on the right side of the barrel. A hand stamp is used and can be difficult to read.