I am trying to find information on the serial numbers for yearly production runs for the colt ar15 sp1 from 1964 to present. Any information will be o. FAL /AR Military style Semi- Automatic Rifle Forum. Hey Guys, I picked up a minty Colt SP1 this weekend and its serial number is SP130419, Ive looked on line and had no luck with date of manufacture, can someone please advise? It is shown with an original finish Colt A1 upper.

Looking at purchasing a Colt SP1 locally that is being represented as a 1966 R6000 model. I've done my research and everything on this rifle checks out except the serial number part of the roll mark. Instead of SER. SPXXXXX it reads SERIAL XXXXX.

I am perplexed and would appreciate some insight before I commit to a purchase. Looking on the internet I've only seen one other image with a serial number resembling that same anomaly. Creole Fires Kat Martin Pdf Printer. I've attached a pic below of the actual gun in question. Any help would be greatly appreciated. Thanks for looking. I have been researching this timeframe of serial numbers. I believe your rifle is legit.

Somewhere between the serial numbers 746X and 850X, there were some marking changes. The first marking change went from SER.SP to SERIAL_ The next marking change went from SERIAL_ to SERIAL Then the marking went back to SER.SP I would appreciate getting some detailed photos of your rifle if you buy it. I would be happy to exchange some more information that I have about this timeframe as well as the pictures I have of these examples (in case you ever need to help prove the legitimacy of your rifle). Here below are the examples I have pictures of that show that end-of-1966 timeframe. SER.SP 0746X SERIAL _ 0791X SERIAL 0792X SERIAL 0820X SER.SP0850X.