Need info on Vietnam Era M1-M2 Carbine spring specifications

It's probably right here on the forum under my nose, but I'm having trouble finding if there's any difference in Operating Slide Spring specs listed in the late 1960's Technical Manuals, compared to the "original specs" as listed in Riesch, Kuhnhausen, and several others. I don't have access to the later (2) TM's and need to know if they show any changes. If anyone has TM9-1005-210-35P (Oct. 1963) or TM9-1005-210-35 (Jun. 1969) I would appreciate any information shown in them regarding the OP Slide Spring - such as: length, OD, ID, wire diameter, coil count, closed coils, ground flat ends, etc. I'm seeing conflicting info after checking several popular Forums. I tried looking up what appears to be the contract code on the package pictured below and had no luck in finding it. Thanks for any help you can provide. - Bob

No differences that I know of...

I've been seeing what appears to be a later P/N or drawing number listed at times, too: 7312453 vs. 5196466 ?? - Bob

edit: I had the 7312453 number confused with the slide stop spring as pointed out in Post #5

Same spring just different wars.

Ordnance drawing number 5196466, dated 18 October, 1968 lists the following specifications:

Wire Diameter________ Approx. .036"
Number of Coils_______ 121
O.D. _______________ .256 +-.004"
I.D._________________ Not less than .179"
Free Height__________ 10.28"
Type of ends_________ squared and ground

FYI, 7312453 is the operating slide stop spring.

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Originally Posted by JackP

FYI, 7312453 is the operating slide stop spring.

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Thanks for solving that mystery for me! I had printed the "Table of Contents" for one of the Nicolaus books from the Carbine Club site the other day - found the reference to "Chapter 3 - Operating Slide" and assumed (I know!) that the spring shown there must be the OP Slide Spring. Oops! Just rechecked, and now see the correct spring just above in the "Chapter 2" grouping. You must have determined the "wire diameter" by calculating - same as I had to do? That's the only dimension that's in spec for the springs I had in question. - Bob

Actually the wire size is specified in the drawing. I forgot to mention that "Wire, music, spec QQ-W-470" is called out in the notes.

Kuhnhausen didn't list the wire size and his was the best information I had at the time. I did find find a very small image of the RIA Drawing 5196466 dated Dec. 10, 1941, and see the wire size is listed. My copy is too small to make out the revision notes or dates. Those would be interesting to know. I do see in the specs that the "direction of coiling" was optional. I've got a "reverse wound" spring of correct length that came in a "grab bag" purchase from SARCO in the mid 90's (didn't know it was for a Carbine at the time!) - need to check coil count, ground flat ends, etc. on that one just to satisfy my curiosity. Thanks, Jack! - Bob

Quote:

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Originally Posted by USGI

TM9-1005-210-35 (Jun. 1969) I would appreciate any information shown in them regarding the OP Slide Spring - such as: length, OD, ID, wire diameter, coil count, closed coils, ground flat ends, etc.

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Bob,
I know your question has already been answered, but in case you are interested TM 9-1005-210-35 dtd June 1969 page 32 says:
Federal Stock # 1005-519-6466, spring, helical, compression:s
0.036 Dia stock
0.256 OD
121 Coils,
Operating Slide
5196466 (19205)

That is all that is listed in this TM no mention of the ground flat ends or closed coils.

Wayne, That's exactly the information I was seeking. Thanks to everyone that provided information - what a great bunch of guys! - Bob

And now you have to buy us beers.:beerchug:

Bruce, I'll have to admit "same spring just different wars" sums it up nicely! - Bob