Whatever someone wants to pay for it.
$1599
250-2500 USD depending on the EXACT model.
Colt has not offered a AR15 in 308
The AR15 series
Depends on model.
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
$800-$2,000.
12k-16k
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
50-1500 usd
100-1000 usd
Depends on the model