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By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
Proofhouse.com has Colt sn data. If not there, call Colt and they will tell you.
@ 40 inches.
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
100-1000 depending on specifics
If the serial number is SP25002; 1973
2005
You will have to call Colt and tell them the serial number.
The serial number and possibly on the bolt.
No serial number given. You will have to call Colt.
$1599
@ 1975