Everything about the Remington Nylon Rifles!

Manufacturer’s Date Codes



Letter Codes are usually located on the left side of barrel,

just above the stock line and just forward of the rear sight.

Date letter code

**The photo above shows the location of the letters**

(The first letter is the month, second letter is the year.)

Month of Manufacture

Jan   Feb   Mar   Apr   May   June   July   Aug   Sept   Oct   Nov   Dec
B         L        A        C        K        P         O        W        D       E        R       X

Year of Manufacture

1959 – F

1960 – G

1961 – H

1962 – J

1963 – K

1964 – L

1965 – M

1966 – N

1967 – P

1968 – R

1969 – S

1970 – T

1971 – U

1972 – W

1973 – X

1974 – Y

1975 – Z

1976 – I

1977 – O

1978 – Q

1979 – V

1980 – A

1981 – B

1982 – C

1983 – D

1984 – E

1985 – F

1986 – G

1987 – H

1988 – I

1989 – J

Please note that many rifles, particularly .22s, did not have serial numbers prior to the Gun Control Act of 1968 rifles were not required to have serial numbers on them. Remington started numbering Nylon rifles in 1967 starting with #40000-419011. In 1968 the numbers ranged from 419012-473710. The serial numbers were located on the bottom of the barrel, below and just back a bit from the front sight. In December of 1968 serial numbers were moved to the receiver cover and re-started at 2100000 and went to 2599999 in January of 1977. In February 1977 an “A” was added and the range was restarted at A2100000. These serial number series pertain to all Nylon rifles, not just Nylon 66s.

Please also note that these code letters refer to all Remington rifles including all the variations of the Nylon line.

Also note that sometimes you will find 3 or 4 letters on the barrel. My understanding is that when sent back to the factory for repairs, they stamped another letter on it to indicate that is had been repaired. It is sometimes difficult to determine which of the letters apply. Best thing to do is use the serial number trick above (w/o serial # pre 67, w/serial # post 67). Then fit the letters as appropriate.

There have been several discussions in the Forum regarding date codes and serial numbers and is a good resource for more information on the subject.

About The Author

Mac created nylonrifles.com. It is the premier website and largest source of information on the internet about Remington nylon rifles. Mac spent 34 years in law enforcement, campus law enforcement and emergency management before he retired. He is a former Federal Firearms License holder and private investigator. He has a BS in Criminal Justice and Master’s Degree in CJ and Security Administration. He has taught criminal justice at a college level and is certified and has taught numerous law enforcement, security and emergency management classes, including classes for the US Dept of Homeland Security. He currently is an emergency management and security consultant as well as being a Revolutionary War Veterans Association Appleseed rifle instructor. He is a Second Amendment Foundation Life Member and NRA Life Member and Range Safety Officer.


  • Winter

    Mine has L G 5, what is the number for? This was my mother's seal rifle and I just passed it down to my 23 year old son.

    • David F

      5 means it was an employee purchase

  • Matt

    @Winter L=Feb G=1960

  • Matt

    @Winter L=Feb G=1960

  • Mgraziano

    Hi. My barrel has an SX stamp. The serial number is 214XXXX. If I reverse the SX to XS, the guide says it was made in Dec 1969. Otherwise, there is no month code for “S”. THoughts?

  • Dusty

    Ok i need a bit of help, my 66’s 3 letter code is AG6 so its march of 1960, this was supposed to be before serial numbers, but under the receiver cover (i think thats what its called, its what the scope mounts on) there is a 5 nuumber string, which is 40225, could someone please explain to me what these numbers are? they are in a rust colored ink or marker, in a fancier,older writing. you can email me at DustStorm@embarqmail.com or just post your response here on the comments, thanks

    • Jason

      Just picked up an Apache pre Ser# in really great Condition
      Only markings are EN 86….

  • Jerry Lee

    Excellent source of information. Gotta love those nylons.

  • Psosinga

    I’ve got a Nylon 66 Apache Black that has a code of JX8, barrel code of 86, and a serial number of 215xxxx. When was mine built? The “J” doesn’t match up with your codes. Thanks!

  • Stan

     My Nylon 66 has a stamp of DFU.. I found it is a sept 1959, but what does the “U” stand for?

  • Hi…Mine has WJ68 stamped on the barrel by the rear sight…however, no serial number under the barrel just behind the front sight. Any ideas?

  • I have a Seneca Green Nylon 66 manufactured in May 1960 (no serial number). Beneath the receiver cover I have a 5 digit number stamped in red ink that reads 36559. Anyone tell me what this means? Thanks ahead of time. nostreborelyk@live.com

  • R L 4 what does the 4 mean ?
    Also my nylon is now shooting 2 shells in at one time would that be shell stop?

  • My Apache 66 has code ‘WU’ for Aug/1971. Directly underneath the letters is the number ’55’. Can anyone tell me what the ’55’ indicates?

  • barry alt

    I have a rem 742 its barrel stamp says wz aug 1975 its serial # starts with a and the info above says They didnt add a till feb 77 so what year is this damn gun

  • Rod

    I inherited a Remington Nylon 66, (pre serial number)…
    Stamped on top of the barrel, in front of the rear sight is,
    PAT. PEND.
    22 L.R. ONLY…..
    Below the above, is stamped, CG U

    If I’m reading the code correct, I get, April, 1960…
    I’m not sure what the U represents..
    Thanks for anyones help…

  • terry

    please help I just got a nylon 66 I have done what was suggested and checked the date codes my problem is according to the code oz3 dates the rifle as a 75 but there is no serial number to be found anywhere on the rifle suggestions please I got the gun from a guy who found it in a storage unit he purchased but before I spend money on repairs I want to check to see if it is legal and not stolen

  • Papa107

    I have a NYLON22 and it looks like it was made in July 1971, on the grip cap it says Mohawk 10C. It is a clip feed, please don’t ever let me lose the clips I have as the new ones don’t work in it. I watched the YouTube take down of one but it was a stock feed tube magazine and was wondering if the disassembly is the same?

  • Gene Lane

    I just bought a really nice Remington Model 66 in a pawn shop today and I am having trouble finding out when it was made. It has Serial Number 2113543 on the side of the receiver, and J L 8 on the side of the barrel. Can you guys give me some help dating this beauty? Thanks!

  • Tennessee Mac

    Like everyone else I have a mystery 3rd letter BFR. Anyone know what the R means?

  • Bryson

    W N 4 U?

  • JB189

    I am looking for a new barrel – chrome for apache 66. I checked brownells, numrich and web. any ideas?

  • shelby

    I have a barrel stamped RJ 40 what does the 40 mean

  • Thomas

    I have a nylon 66 with no serials and wfo stamped on left side of barrel and a symbol on right side looks like a male symbol

  • jerbear

    My pre-serial # 66 only has a barrel mark on the right side of the barrel that is (I).Anyone know what year of manufacture it is?

  • Pastor Stephen

    I have a Seneca Green Nylon 66 marked “LG5”. That makes it FEB 1960. I read on this page somewhere that the “5” means an employee. It is only in fair condition (initials scratched into receiver, scratched butt stock, missing rear sight). I live in the Panhandle of Texas. What would a fair value be on this?

  • bill vankempen

    have just bought a nylon 66 at a gunshow with original scope. couldn’t be happier. makes me feel like a kid again. can’t wait for this snow to disappear so I can get out and use it. Thanks for your help.

  • ernie filep

    I HAVE a green Apache 77 with date code V 01 14 .Serial # starts with “A”. Any help please. Thank you. Ernie.

  • Joel

    I have a 66, what year does my code say? There’s 3 letters. F X R. No serial # found?

  • Laser Luther

    Mine is PF6 June 1959 thinking the 6 might be June 6th could be wrong.

    • Mac66

      If it doesn’t have a serial number and has the old style rear sight screw it is a June 59 rifle. The 6 doesn’t mean anything. If it has a serial number it is a June 87 rifle.

  • Codie Michelle Nelson

    I just inherited a CBC Remington nylon 66. How could I date it? It doesn’t use the same code and I can’t find the right one.

  • Michael Martini


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