Date of manufacture

You date Remington rifles by the two or three alpha letters stamped on the left side of the barrel just ahead of the receiver.
Go to the Remington forum at RimfireCentral and they have a sticky with the conversion table.
 
Based on this I'd guess 1986,1987

Firearm Model History
Nylon 66
Description: Autoloading Rifle
Introduction Year: 1959
Year Discontinued: 1989

Total Production: Approximately: 1,050,350
Designer/Inventor: W.E. Leek, C.H. Morse, H.W. Young
Action Type: Autoloader
Caliber/Gauge: .22 long rifle
Serial Number Blocks: Starting: 00001
Ending: 2600000

Grades Offered: Nylon 66
Nylon 66MB
Nylon 66GS
Nylon 66SG
Nylon 66AB
Nylon 66BD
Variations: Nylon 66 - 150th Anniversary Rifle
Nylon 66 – Bicentennial Rifle
 
Slash5 said:
You date Remington rifles by the two or three alpha letters stamped on the left side of the barrel just ahead of the receiver.
Go to the Remington forum at RimfireCentral and they have a sticky with the conversion table.

The table at Rimfire central does not match up to the info HiCaliber has supplied.
 
Everything you ever wanted to know about Remington Nylons including owner's manual downloads:

http://sports.groups.yahoo.com/group/nylonrifles

I copied & pasted some of the date code definitions:

"Based on the article by Donald Simmons in the 1991 Gun Digest I've
been able to decode the numerical month and year manufacturing codes
for the Nylon 66 and other models.
The coding is based on a two letter code. The first letter is the
month and the second is the year. From what I can determine this two
letter code is stamped on the left side of the barrel forward of the
receiver cover just above the stock line. An example would be my
Mohawk 10C whose code is WZ. W is August, Z is 1975, so mine was made
in August of 1975.

Something I just noticed when I wrote the code out is that is spells
BLACKPOWDER X ! I wonder how many of us knew that???

1st Letter=Month
January B
February L
March A
April C
May K
June P
July O
August W
September D
October E
November R
December X

2nd Letter=Year
1959 F 1971 U 1983 ?
60 G 72 W 84 E
61 ? 73 X 85 ?
62 J 74 Y 86 ?
63 K 75 Z 87 H
64 L 76 I
65 ? 77 O
66 N 78 Q
67 ? 79 ?
68 R 80 A
69 ? 81 B
70 T 82 C

"
 
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