You will have to call Colt and tell them the serial number.
Variant of the AR-15 manufactured by Colt. It had a 'slab side' lower and no forward assist.
Colt has not offered a AR15 in 308
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
According to info available on ar15.com, your weapon was manufactured in either late 1972 or early 1973. I own one made in 1974.
Call Colt and they will tell you.
Proofhouse.com. Call Colt also.
@ 40 inches.
The AR15 series
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
Proofhouse.com has Colt sn data.
You will have to call Colt and provide the serial number to find out.
Try AR15.com Try AR15.com