Quoted:
There's nothing magic about determining the date. This is a resource provided by Winchester that goes up through the end of 1991. It's in PDF format so you can save it to your hard drive or print it.
Winchester serial numbers
The Model 94s will be found on page 9 and it indicates yours was made in 1988, the third year of Model 94 Ranger production.
Consequently, it will be an angle eject with a half cock notch, and it will not have a cross bolt safety or a tang safety.
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I agree 3C is the right elevator for a post 64 Ranger, but it does not matter on the post 64 Winchesters as they are all the same, and that's basically the case on the post WWII pre-64 winchesters as well.
However, way back in the day, Winchester used sight elevators that were regulated by caliber so that the rifle could be zeroed at 50 yards on the bottom step, with each successive step increasing the zero range by 50 yards. That gave the shooter steps for 50, 100, 150, 200 and 250 yards. It was a nice feature that required a great deal of attention to detail by Winchester and reflected the overall quality of the company in it's earlier days.
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Some key post 64 Model 94 Winchester dates to remember:
1. The Big Bore 94 was introduced in 1978 for the 1979 model year in .375 WIn and two years later in .356 Win and .307 WIn
2. The XTRs were made from 1978 through 1989.
3. In 1981 with the purchase of the Winchester plant by ISRAC, the receiver alloy was changed to 4144 steel and those rifles can be re-blued by normal means. The alloy used from 1964 through 1981 had a high chromium content and could not be blued by conventional means. The 1964 through 1968 receivers were blackened using the Du-lite 3-0 process, from 1968-72 they were black chrome plated, and from 1972 to mid 1981 they were plated with iron and then blued with the normal Win blue/Oxyblack process.
4. Angle eject was introduced in 1983 for the 1984 model year on the regular Model 94s
5. Angle eject for big bores came out in 1985
6. The Ranger series Model 94s were introduced in 1985 and stayed until 2007
7. The rebounding hammer appeared on the Model 94 in 1990
8. The cross bolt safety was introduced in 1992
9. The tang safety replaced the cross bolt safety in 2002.