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MIL-R-45979, Military Specification, Rifle, 7.62MM: M14, National Match

This is a discussion on MIL-R-45979, Military Specification, Rifle, 7.62MM: M14, National Match within the The M14 forums, part of the M14 M1A Forum category; Cut and paste the below link to get to the Military Specification for a National Match M14. I found it very interesting. Brian http://assistdocs.com/search/documen...method=CONTENT...


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Old March 28th, 2012, 06:55 PM   #1
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MIL-R-45979, Military Specification, Rifle, 7.62MM: M14, National Match

Cut and paste the below link to get to the Military Specification for a National Match M14. I found it very interesting.

Brian

http://assistdocs.com/search/documen...method=CONTENT

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Old March 28th, 2012, 06:59 PM   #2
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i hope this doesn't open a can of worms.

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Old March 28th, 2012, 07:27 PM   #3
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OK,cool.But will add this comment.I only looked at the page,I didn't "dig into" it yet.The 2 dates noted are 76 and 86. I believe BUT WON'T SPEAK FOR HIM,that Arts' NM thread are in regards to the original "purpose built" NM rifles made by the original Springfield Armory and TRW.Not sure when the last TRW built NM rifle went out their door,but SA was closed down in what 68?
Thanks for posting this OP,,I'm gonna be sucking up any and all info I can from this document! : )

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Old March 28th, 2012, 08:04 PM   #4
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Quote:
Originally Posted by m1sniper View Post
OK,cool.But will add this comment.I only looked at the page,I didn't "dig into" it yet.The 2 dates noted are 76 and 86. I believe BUT WON'T SPEAK FOR HIM,that Arts' NM thread are in regards to the original "purpose built" NM rifles made by the original Springfield Armory and TRW.Not sure when the last TRW built NM rifle went out their door,but SA was closed down in what 68?
Thanks for posting this OP,,I'm gonna be sucking up any and all info I can from this document! : )
this is what i was referring to.

I am VERY confused.

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Old March 28th, 2012, 08:23 PM   #5
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A Military Specification is only a specification. When a M14 was built to this specification if any were built to this specification cannot be determined. What I found interesting was the revision in 1986 which changed the headspace requirement to the 1.6330 minimum to 1.6360 inches maximum headspace. I also could not find a reference to modifying the flash suppresser by reaming with a #7 taper reamer, but maybe this was in a referenced drawing requirement.

Brian

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Old March 28th, 2012, 08:40 PM   #6
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Any idea where to find the drawings referenced in the document?
I cannot find them.

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Old March 28th, 2012, 10:49 PM   #7
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Quote:
Originally Posted by WestCoastM1M14 View Post
A Military Specification is only a specification. When a M14 was built to this specification if any were built to this specification cannot be determined. What I found interesting was the revision in 1986 which changed the headspace requirement to the 1.6330 minimum to 1.6360 inches maximum headspace. I also could not find a reference to modifying the flash suppresser by reaming with a #7 taper reamer, but maybe this was in a referenced drawing requirement.

Brian

The only official reference to the flash suppressor modification (that I'm aware of) is in the document that the Army's Marksmanship Unit (AMU) used as a guide to prepare the rifle for national matches.

You can download a pdf copy at;

http://stevespages.com/pdf/m14_accurizing.pdf

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Old March 29th, 2012, 02:33 AM   #8
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I found the front band and stock ferule clearance requirement of 1/64 interesting.

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Old March 29th, 2012, 05:41 PM   #9
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Understand that the clearance between the stock ferrule and barrel band is from the front surface of the ferrule and not between it's bottom and the barrel band's lower lip. Downward pressure at this point between 4 and 7 pounds is desired to help stabilize the barrel. This allowed free movement under recoil forces and consistant repositioning after.

The USAMU accurizing manual clearly illustrates the reaming requirement for the flash suppressor. My copy of this document was printed 11 Mar. 76 which preceeds this copy of MIL-R-45979. I have no idea why it was left out. The NM flash suppressor drawing 9352718 is dated 82-06-07. It indicates the tappered bore of the suppressor is to be .375 + .004 at the barrels muzzle to .406 + .004 at the suppressor muzzle.

The US M14NM rifle was constantly modified and changed over the years it was issued right up to 1993 when the M16 became the primary advanced marksmanship weapon. Most of the primary modifications were developed before 1976. The heavy barreled, oversized stock, rear lug version was not standardized until 1983. Even then, most NM rifles were issued with medium weight barrels and standard sized stocks and the heavy match rifles were very rare except in civilian circles. Only the top military teams were issued heavy NM rifles.

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