Blue Book of Gun Values
@ 40 inches.
100-1000 depending on specifics
100-1000 USD
100-1000 USD
Proofhouse.com has Colt sn data. If not there, call Colt and they will tell you.
To determine the age of a Colt AR-15 A2 HBAR Sporter with the serial number SP221219, you would typically need to consult Colt's production records or a firearms expert. However, Colt generally produced the Sporter model in the late 1980s to early 1990s. Based on the serial number, it's likely that this particular rifle was manufactured in the late 1980s.
The AR15 series
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
12k-16k
Contact Colt, on line aucitons.
Depends on the model
50-1500 usd