If multiple models appear for your serial number simply match the date with the. I don't have a SP1 rifle currently, I only have an all Colt parts rifle that I put together myself, from a like new condition Colt Match Target HBAR stripped lower receiver, Colt lower parts kit, new Colt M16A2 fixed buttstock group, new never issued USGI Colt M16A2 upper half (built in the 1980s) with Colt M16 full auto bolt carrier group. Enter the serial number, without spaces or dashes, to search the database. The lower receiver has the Colt four line markings with the four digit serial number 'SER SP 07386' indicating. It has the early style upper receiver with no provisions for a forward assist and the correct early Colt 'triangle' proof mark on the upper receiver. I also bought a new Sporter II rifle back in 1984 and it had a forward assist with teardrop style plunger (no shell deflector), but the very early Sporter II models does not have forward assist same as the SP1 model. This is an outstanding 1966 production Colt AR-15 SP1 semi-automatic rifle. I had never seen a factory new SP1 with a forward assist, if there are a few the owners probably upgraded their upper receiver with an A1 type with forward assist later on. My first ever Colt AR-15 was a new SP1 rifle that I bought in 1971, it had an A1 type birdcage flash suppressor, no forward assist, and no storage compartment in the buttstock.

So yours would be made about 1983, a lot of people said that the production of the SP1 model ended in 1982, but they probably made some more from 1983 to 1985. Click to expand.I kept an informal Colt SP1 notes about serial numbers that was discussed in a large AR site survey.

Colt sp1 serial numbers