Yes, despite what all these "internet
experts" claim, Colt made them 1970-1980. Yes, it's true, there are some floating around that folks changed on their own, but Colt made them at the factory that way too. They had early M-16 uppers, most had no forge codes on the uppers.
The front pivot hole diameter is smaller than the receiver and the factory used an offset screw to mate the pair. These rifles are scarce, and worth considerably more than the slab side SP-1 everyone drools over. It's the closest design to a Vietnam era M-16 you will find. Don't pass up on one because someone said no SP-1's had forward assists. They are just plain wrong.
Variant of the AR-15 manufactured by Colt. It had a 'slab side' lower and no forward assist.
Proofhouse.com has Colt sn data
You will have to call Colt with the sn to find out.
What is the manufacture date of a Colt AR15 rifle serial number 192754 model SP1
Proofhouse.com has Colt sn data. If it's not there, call Colt
The Colt AR-15 Model SP1 with the serial number SP 204803 was manufactured in approximately 1979. Colt typically produced the SP1 models in the late 1970s and early 1980s. For precise dating, you may refer to Colt's manufacturing records or consult a Colt historian.
You can find out at Proofhouse.com in the Colt tables.
Proofhouse.com has Colt sn data.
You will have to call Colt to find out.
Proofhouse.com has Colt sn data.
100-1000 or so
if it is a 223 cal, then yes