Made 1964 to present
You will have to call Colt to find out
You will have to call COLT
$1384.99
AR-15 is a trademark owned by Colt - thus, no other manufacturer may market their rifles as AR-15 unless they are specifically licenced from Colt to do such. LAR-15 is simply Rock River's alternative name to "AR-15" in order to avoid infringing on Colt's trademark.
Colt data at Proofhouse.com
You will have to call Colt to find out.
You will have to call Colt with the sn to find out.
No such sn in the AR-15 series
AR-15
On the receiver
it was modified................
The Colt AR-15 is a sporter rifle