Best reference is the "The Black Rifle II" by Bartocci
The AR15 series
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
12k-16k
50-1500 usd
100-1000 usd
Depends on the model
Depends on markings on upper.
In the USA
100-1500 depending on specifics
value depends on overall condition.................
No such model exists.
Colt has not offered a AR15 in 308