Serial Number Prefix	Model Name	Sample Model
BD	6721
CC	Colt Carbine	R6520
CH	Competition HBAR	6700
GC	Government Carbine	6520
GS	Governmodel Model Service	6550
MH	Match HBAR	6601
ML	Match Lightweight	R6530
MT	Match Target
SP	Sporter	SP1 or SP2
ST	Sporter Target	6551
TA	9mm	64506430

Above Information Courtesy Stokes

Colt SP1 date of manufacture. You have a six digit serial that is 80, and I have a 5 digit so mine is 68. Sorry for the confusion. Any trolls picking on my typos, move on. Colt Firearm Serial Number Lookup - Year of Manufacture Originally Posted by msmp5 (I did try the search function on here to see if this has been discussed before, but I didn't find it; of course, I am old and barely computer literate, so I might have done it wrong!).

Colt AR15 and M16 Serial Numbers, 1960-1972. This memo’s been around as a scanned, non-OCR’d.pdf for a long time. For a look at a serial number list that draws on multiple sources, see this thread at. Subject: M16 Serial Numbers. Date: February 2, 1973. In December of 1960 we started roll marking AR15 rifles. Third Generation Colt Single Action Army Serial Numbers. 3rd Generation Colt Dates of Manufacturing Updated to 2012. I always wanted to know the birth date of my Colts and that is what brought me to this site.

Disclaimer: This list is correct to the best of my knowledge, however, I accept absolutely no responsibility for the accuracy of this information or for the consequences and/or damages occurring from any inaccuracies. I have compiled this list for the purposes of sharing information only. This is not intended to be used in any way except for personal entertainment. It is a compilation of both personal information and information submitted from others, mostly from the Internet. ALL SERIAL NUMBERS SHOULD BE VERIFIED FROM THE MANUFACTURER PRIOR TO ANY PURCHASE OR ASSEMBLY. It should be clearly noted that it is a felony to possess a Post-Ban (newly assembled after Sept 13, 1994) assault weapon. Please note that BATF has ruled that 'Pre-ban' and 'Grandfathered' are two different things. A Pre-ban lower is only grandfathered if it: 1. was a complete rifle prior to 9/13/94; 2. possessed two banned features (pistol grip and CAR stock assembled); or 3. was part of a complete weapon kit, either assembled or not. This list does not discern between 'Pre-ban' and 'Grandfathered' as it is very nearly impossible to find that detail of information. If any information presented here is found to be incorrect or you have additional information to contribute, please contact me via E-Mail (hkusp40@midmaine.com) and I will update and re-issue the list. Note:All items marked with a single asterisk (*) are taken from http://home1.gte.net/bblakley/ban/index.htm. The year/serial numbers under Colt SP series was forwarded to me by an individual whose return address I no longer have. Double asterisk (**) under Bushmaster, a person on the internet e-mailed me that he had a lower that was shipped stripped (thus not a complete rifle) in 1991 from Bushmaster with serial #0327XX - ALWAYS CALL TO VERIFY. Finally, BATF has allowed some pre-ban damaged to be replaced with post-ban lowers with numbers outside the ranges given below while retaining the grandfathered status. They will send a letter documenting this and allowing the original manufacturer to proceed with the replacement. Colt (800) 962-COLT

Year	Serial Number Range	Pre Ban	Post Ban
1963	SP00001-SP00023**	X
1964	SP00101	X
1965	SP02501	X
1966	SP05600	X
1967	SP08250	X
1968	SP10750	X
1969	SP14000-SP14653	X
1970	SP15001-SP15473	X
1971	SP16001	X
1972	SP19401	X
1973	SP24201	X
1974	SP32601	X
1975	SP43801	X
1976	SP55301	X
1977	SP67651	X
1978	SP83400	X
CC001616 and Below	X
CH019500 and Below	X
GC018500 and Below	X
LH011326 and Below	X
MH086020 and Below	X
NL004800 and Below	X
SL027246 and Below	X
SP360200 and Below	X
ST038100 and Below	X
TA10100 and Below	X
BD000134 and Below(AR-15A3 Tactical Carbine - very rare model)	X
MT00001 and Above	X
BK000001and Above (CAR-A3)	X
CST000001 and Above (Began Late 1997 Production)	X
CMH000001 and Above	X
CCH010000 and Above - Post Ban MT6700, MT6700C and MT6700CH series, 1998 production	X

Serial Number Information Courtesy Geremy Chubbuck

The date of manufacture is determined by the Colt model type andserial number. See: www.proofhouse.com/colt/index.html

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