There are also a small number of US Air Force M16 Colt's Model 604 found in this serial number range. US Property marked XM16E1 Colt's and M16A1, both Colt Model 603. Highest know example is 418,XXX and dates from the early 1970’s. Zero US Property marked rifles have been observed. Only a few rifles/carbines made in this serial number range and known examples are spread out over several years of production. There are also examples of commerical/export marked models using the 20X,XXX serial number range produced in the late 1960's. US Property marked US Air Force M16 Colt's Model 604, and a few commercial export models. contract (note, CAR-15 refers to a family of Colt's weapons, not just short ones). US Property marked US Air Force M16 Colt's Model 604 & US Army XM16E1 Colt's Model 603.Ĭommercial/export CAR-15 series and US Property marked GX series for S.A.W.S. US Property marked US Air Force M16 Colt's Model 604. Few hundred commercial/export examples were made that lack US Property markings. US Property marked AR-15 Colt's Model 02 issued to US Advisors in Vietnam, and US Air Force. Some sold commercially to police departments, small numbers to foreign militaries such as Malaya, India, Australia, Burma, and Singapore. US Air Force/Project AGILE/SEAL issue Colt's AR-15 Model 601, roll marked ARMALITE. USGI SERIAL NUMBER DATA BASE (serial numbers listed in chronological rather then numerical order): TA: There are only around 10,000 TA model guns and less than 8000 without sear block. Serial Number Prefix Model Name Sample Model