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Curio & Relic/Black Powder Curio & Relics and Black Powder Firearms, Old School shooting fun!

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  #1  
Old 03-15-2009, 10:07 AM
user name user name is offline
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Default Bent Garand op-rod?

<- first time garand owner. Can you see a bend in the op-rod? Do they all have some sort of bend in them or did the seller screw me?

Thanks!
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  #2  
Old 03-15-2009, 10:09 AM
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AK4me AK4me is offline
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I dont think it should be bent, sounds like someone was using the wrong ammo. someone else here will know more.
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  #3  
Old 03-15-2009, 10:12 AM
nic nic is offline
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Garand Op-Rod is supposed to be bent for proper functioning. Read this article from Fulton Armory:

Quote:
Everything you wanted to know about M1 Garand operating rods but were afraid to ask!
by Walt Kuleck & Clint McKee


--------------------------------------------------------------------------------


Perhaps the most difficult part of the M1 Rifle to mass produce was the operating rod, or op rod. Its design was a consequence of John Garand's conviction that a successful military semiautomatic rifle needed the power of a full stroke, gas impingement operating system for reliable functioning under all combat and climatic conditions. At the same time he had to minimize the effect on aim of the gas system's reciprocation.

Thus, the original "gas trap" system of the first Garands (up to Serial Number circa 50,000) was designed to ensure that the bullet had left the muzzle prior to any action parts moving; consequently, the original gas trap Garands are reputed to be the most accurate of all service grade (non-accurized) M1s. As this arrangement was found to be deficient in strength, particularly when the bayonet was attached, and to carbon up over time thus reducing its effectiveness, the "gas port" system familiar to all M1 enthusiasts was born. With the gas port now some inches behind the muzzle the operating rod began to move before the bullet left the muzzle, but measurements on an M14 with an M1 gas system indicate the op rod moves only about .03" by the time of bullet exit. The comparable figure for the T44 (M14) with gas cut-off and expansion system was .05".

So we see the reason for the length of the M1's op rod. The reason for its curvaceous beauty was to bring it from near the muzzle around the barrel and up to the bolt, where it operates the action proper. The op rod is made in two parts, the tube and the handle. They are then welded together to create the completed component. During WWII the right angle joint where the two pieces came together proved to be a stress riser; thus after the war op rods from rifles under rebuilds were given a stress relief milling cut (the shape of a racetrack) in that area. If it's there it's obvious when you're looking at the drawing number. When M1 production resumed in the '50's all the op rods from all three manufacturers were made with this stress relief cut from the start.

Uncut rods are not the best idea for shooting, but are necessary for collectors' restorations. If your shooter has an uncut rod, hang it on the wall or sell it to a collector and use a good cut rod.

Actually, no op rod was really "problematic"; the WWII op rods would crack after a great deal of use & abuse, at the right angle where the handle goes to meet the tube; that's why the stress relief cut was ordered & why most WWII op rods have been "cut."

Post WWII, all op rods were made with the stress relief radius "built in." D35382 (no rev number) and all the "65" and "77" prefix rods are so made.

The final op rod design is that with drawing number 7790722-RA (Remington Arms) or -SA (Springfield Armory). I like to call it the "77" op rod, but as it is often found stamped "NM" it is widely known as the National Match op rod. It had a subtle change to the tube's curve to fit it somewhat more tightly around the barrel. This design was originally intended for and used in the building of Type 2 National Match rifles at Springfield. When the supply of good op rods dried up, this design was used for general rebuilds in the '60's. Quite a few went to Korea and have come back again as parts and on rifles. You'll see them both with and without the "NM" marking, but the rods are identical nonetheless.

One of the most skilled trades at Springfield Armory and the other M1 manufacturers was "rod bending" to the standard guage. Those who did this job well were highly regarded for their abilities.

For those of you who might have wondered, that "special jig" in the Navy Van at Camp Perry is the op rod gauge! It was used to check the many critical areas & bends of the M1 Garand op rod. It was not used to bend 'em, just to check 'em.

It was possibly the most incredible gauge ever made to gauge a part for a U.S. Service Rifle. The cost to make such a thing is mind boggling. Such extravagence in gauging reached its zenith with the Garand in general, and this one in specific! The Garand even had a gauge to measure serviceability of the op rod spring tension. Sheesh, just put a new spring in her! Springfield Armory, (the original of course), could have bought tens of thousands of new springs for the cost of just one of these gauges, not to mention the time required to test each spring.

I'd encourage all of you who attend the DCM/CMP Highpower Service Rifle phase to go & ask the Navy Van to see this gauge. It's a real wonder.

Lastly, the silver "button" on the end of the op rod is the gas piston. It should be at least .525" in diameter and within .00035" of round. Max dimension is .526".

--Walt Kuleck & Clint McKee

Last edited by nic; 03-15-2009 at 10:18 AM..
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Old 03-15-2009, 10:14 AM
nic nic is offline
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In short, DO NOT, repeat DO NOT try to "straighten out" your operating rod. You may inadvertently make it and your rifle completely inoperable.
One thing you should do just to check for proper function is to take the barreled action from the stock and remove the operating rod spring. Tilt the barreled action at a 45 degree angle. You should see that the operating rod will slide freely, just by the force of gravity. If it does this you are good to go.

Last edited by nic; 03-15-2009 at 10:17 AM..
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Old 03-15-2009, 10:14 AM
polygunner polygunner is online now
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Garand op rods are bent. I guess the question is, is it bent wrong or right.
Take the main spring out and see if the op rod and bolt will move smoothly without binding. If it does you're probably good to go.
I assume you're talking about the round portion that rides in the stock and handguard. Not the section that is foreward of the handle that is exposed on the right of the receiver. That should be strait.
hth
pg
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Old 03-15-2009, 10:29 AM
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thanks! yes it moves freely...life is good!
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Old 03-15-2009, 10:41 AM
scr83jp scr83jp is offline
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Quote:
Originally Posted by user name View Post
<- first time garand owner. Can you see a bend in the op-rod? Do they all have some sort of bend in them or did the seller screw me?

Thanks!
If you want to reduce the stress on your garand buy yourself a gas system from www.mccannindustries.com and read their tutorial,they modify garands into 338 & 458 mag rifles with a punch.The op rods are 'bent' for parts www.northridgeinc.com and for complete rebuilds go to www.miltecharms.com I modified my garand with a Redfield Hooded Globe Front sight with inserts that is available from Brownells.If you want a copy of the 3/86 Am Rifleman article "Reloading For The M1 Rifle" send me your emaill and I'll send it to you it allows for improved accuracy in fact I & other club members used the data to make up a load for a successful mule deer hunts in Colorado.If you have a new garand you can go to www.surplusrifle.com for info, the CMP site has lubing instructions where to use grease and where to use oil. I set up garand qualification matches for our gun club in yucaipa from 1980 thru 1986 had lots of participants including sports writers,law enforcement and shooters from S Calif.

Last edited by scr83jp; 03-15-2009 at 11:05 AM..
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