Original SA 1943 annealed receivers

I believe this to be an original 3-43 SA annealed receiver..1471154..
Anyone else have one near it, originally annealed by SA? Andy
Purchased over 3o years ago, a complete rifle, with McF cartouche.

http://i313.photobucket.com/albums/l...g?t=1249516259

http://i313.photobucket.com/albums/l...g?t=1249516460

http://i313.photobucket.com/albums/l...g?t=1249516513

http://i313.photobucket.com/albums/l...g?t=1249516568

http://i313.photobucket.com/albums/l...g?t=1249516598

http://i313.photobucket.com/albums/l...g?t=1249516628

My 176xxxx has same discoloration just behind sight base to heel of receiver. Dont know if it was annealed though.

I just got two barreled recievers, 177xxxx and 144xxxx. Both are annealed.:beerchug:

I've got one only 371 away from yours :thup: Except my EMcF cartouche is a little more worn than yours.

Brian

https://www.milsurps.com/images/imported/deleted.gif[/IMG]
https://www.milsurps.com/images/imported/deleted.gif[/IMG]
https://www.milsurps.com/images/imported/deleted.gif[/IMG]
https://www.milsurps.com/images/imported/deleted.gif[/IMG]
https://www.milsurps.com/images/imported/deleted.gif[/IMG]

my 2.06 is annealed

My six-digit, Nov.42 is annealed. S/N 9805XX. SA

Great information, and since Crock57 is so close to mine, and annealed...its probably an SA "quick fix" factory lead pot annealing, as opposed to U.S. ordnance in the field?
Andy

This came from Rock Island in 1975 on the receiver exchange program as listed in the American Rifleman. You could send a defective M1 receiver to Rock Island plus $21 and receive a barreled action. The barrel is dated S-A 4-43 and has a TE of 1.0. This unit is about as new as you can find

RCS, what is the SA sn? You mated it with the stock? Was the RIA still the U.S. Government arsenal, and is the barreled action totally original? I have an 8=41 brand new, but I like some hopeful WW2 service from mine..
Andy

Problem with trying to idenify and nail down when they did this is that they seemingly picked rifles out of sequence at SA and in the field so enough rifles were modified to provide adequate amounts of Grenade-launching capability. We know they needed thousands of Garands modified to create an adequate supply and there lies the proof in the pudding, some Garands very close to annealed receivers aren't.

Most I've seen posted are in the 1 to 2 mil range, mine is a six-digit, further proof of the randomness.

How were annealed receivers related to grenade launching ?

My 1746xxx is annealed and 828xxx is not. HTH Gregg

Receivers were cracking, from experience in North Africa launching rifle grenades, it was found that softening the steel receiver heel, and sometimes legs, by lead pot annealing, prevented the cracking, till the steel mixture was changed.
I think the problem was solved by 1944.

valve screw assembly B147851 isued with the M7 launcher in 1943, replaced by the poppet assembly in Jan 1944.

The early valve screw vented the gas when launching grenades or ground signals and also prevented the M1 from semi auto operation with ball cartridges (as the gas system was vented by the M7) until the M7 was
removed.

My question, how is the bolt (when launching a grenade or ground signal) making contact with the receiver heel when the gas system is being vented
by the valve screw and M7 ?

Quote:

---

Originally Posted by RCS

valve screw assembly B147851 isued with the M7 launcher in 1943, replaced by the poppet assembly in Jan 1944.

The early valve screw vented the gas when launching grenades or ground signals and also prevented the M1 from semi auto operation with ball cartridges (as the gas system was vented by the M7) until the M7 was
removed.

My question, how is the bolt (when launching a grenade or ground signal) making contact with the receiver heel when the gas system is being vented
by the valve screw and M7 ?

---

It isn't, the annealed receivers were done before the advent of the Poppet-Valvescrew as a tempotary fix. The special round used created too much bolt-speed and the bolts were slamming against the rear of the receiver. The early screw was solid. Unless I misunderstood your question.

RCS is right. The grenade launcher was purposely designed so it could not be used with the early unvented gas screw. The pin on the launcher was too big to fit in the hole of the single slot screw. A vented screw was sent with each grenade launcher and any rifle that did not have the new vented screw could not be used for grenade launching.

Have receiver 1458xxx. Probably Feb. Mar. 43. It does have a 51 H@R barrel.
Have restocked with a Boyd. Rifle is very accurate.

I have a few early rifles with the solid gas cylinder lock screw, I have not been able to install the M7 or variations M7A1 etc launcher on a rifle with an original solid lock screw. Also as a note, the M5 bayonet will not fit a rifle
with the solid lock screw either.

There have been fake or repro solid lock screws available for sale and these
screws have a larger diameter center hole which will fit the M5 bayonet

Annealed receivers due to Grenade Launching is the same myth as why they altered op rods.

Go here for a complete explanation:


http://www.billricca.com/myths.htm#anneal

Thanks bill, always willing to learn.

My first M1 rifle, a 1.4 million March '43 with original barrel, is annealed. It was esentially a brand new rifle when received from the CMP. Mixmaster, of course, but it came with a WRA bolt, no cartouche WRA stock, HRA oprod, non-relief cut rear handguard with grooved handguard clip and Type II lockbar rear sight. It is now correct and my dad has it. He loves it!