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Home  ›  How To Repair A Loose Rear Sight On A M1 Carbine

How To Repair A Loose Rear Sight On A M1 Carbine

Written By Monday, 14 February 2022 Add Comment Edit

#one

jim c 351

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Posted 04 April 2016 - 08:36 AM

Has anyone e'er noticed the rear sight becoming loose afterwards a lot of total auto firing ?????????

Jim C


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#2 Kilroy

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Posted 04 Apr 2016 - 09:xiv AM

I've had two (semi auto) carbines where the rear sight worked itself loose. First was an Ibm and second was a Saginaw. It was suggested to me that you lot could fix it either by removing the sight and peening the top of the receiver with a hammer or by cutting a small shim out of a soda tin can and placing it under the sight when you insert information technology. I did information technology for the IBM and information technology worked fine accuracy was within normal limits for a carbine. the Saginaw I haven't messed with yet.

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#3 dalbert

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Posted 04 April 2016 - 04:11 PM

I have one M1 that has a loose rear sight.

David

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#4 ron_brock

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Posted 04 Apr 2016 - 04:41 PM

Didn't they later stake the sights? I believe I changed a late model sight on my gun and information technology had been staked

Ron

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#v jim c 351

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Posted 04 April 2016 - 07:thirteen PM

Thanks to those who have commented thus far. Hopefully others will join in.

Reason for asking.----

A member on this board and also a TCA member recently bought an M2 carbine. Its a Saginaw over stamp.

Later on doing a fair corporeality of full auto firing the rear sight became very sloppy and could be pushed out of the dovetail with no effort.

He came to me for assist and I sorted thru a box of carbine sights and selected 1 that fit the tightest. I had to pound it in with a brass rod.

He returned a while later with exactly the aforementioned problem.

This time I inserted a shim .0015 thick and once again drove the sight on with a contumely rod.

Yesterday , at a steel plate shoot, the exact same affair happened, this fourth dimension while I was shooting the carbine.

This has got me baffled. Information technology appears the dove tail is stretching. A scary thought since the receiver appears to be overstressed.

Increasing the shim thickness without knowing what is going on doesn't seem to exist the reply.

Any ideas what is happening here??

Jim C


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#half-dozen n64atlas

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Posted 04 April 2016 - 08:35 PM

What ammo is he using and has he change the op rod spring lately? Check the back,inside of the receiver for peening from the bolt hitting it.

As for ammo, if reloads, they might be too hot for the op rod spring that is installed or the op rod spring is weak.


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#vii Kilroy

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Posted 04 April 2016 - 09:32 PM

The type II and type III sights are in fact supposed to be staked. The staking is heavy and was done inside the sight. The sight was moved all the way left, staked on the right side front and dorsum. The staking went through the dovetail of the receiver and deformed information technology into the sight, so the sight was moved all the way to the right and the process repeated. Without staking the sight will come loose.

There is a special tool to printing the sight in and the sight should simply be able to be inserted from the right to the left. As the dovetail goes left it does get narrower making the sight go tighter equally it goes left and should bight downwardly roughly center. If it goes all the manner though the left side then the receiver is out of spec.

I tin can pull some of my carbines out with the type I sights tomorrow that I can yet access the female person dovetail and take measurements with a micrometers of that volition help you. I doubt that the receiver is stretching, merely I've been wrong many times earlier.

The receiver peening that I mentioned earlier isn't something I made up, it is in the ordnance technical manuals and if you want I can look for a page number tomorrow. I was not comfortable doing this because in the ordnance manual it says something as simple as 'peen the top of the receiver dovetail with a hammer to tighten a loose sight'. My overthinking self doesn't know how hard or how big of a hammer to peen it with and am paranoid about doing impairment.

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#eight n64atlas

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Posted 05 Apr 2016 - 12:fifteen AM

rear sight tool


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#nine jim c 351

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Posted 05 Apr 2016 - 06:27 AM

Let'southward stay focused on the problem at hand and non go lost in the weeds.

I take a TM and I am aware of the HEAVY staking of the sight. Previous owners staked it and then heavy that there is no metal remaining for staking.

I accept owned carbines for the final 55 years and have been irresolute sights and shooting them for all those years. I've never owned and volition never owned a sight removal tool. I use a brass or aluminum rod.

The problem is , what caused an already installed sight to get loose from shooting.

Why would a sight , that had to be pounded on, exist easily moved back along with merely fingers.

N64 is probably on to something with the weak spring idea. I'll ask the owner to bank check its length. Also I'll try to find out almost the ammo.

Thanks for the comments.

Jim C

Edited by jim c 351, 05 April 2016 - 11:37 AM.

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#10 issues

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Posted 05 April 2016 - x:47 AM

Hey Jim, this is fashion off rails but I thought of you when I saw this gun...

http://world wide web.subguns.c...cgi?read=260990


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#eleven jim c 351

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Posted 05 April 2016 - xi:36 AM

issues,

That is a beautiful 07.

Please repost it on the outlaw/lawman forum.

I'll bet Sandy will really similar it.

Jim C

Edited by jim c 351, 06 April 2016 - 10:53 AM.

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#12 emmagee1917

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Posted 05 April 2016 - 01:46 PM

Some things that have worked in the past .

Blue loctite in the dovetail gaps .

Punch dimple the dovetail groove that rests under the rear sight .

Disassemble the rear sight and drill and tap one or two set up screw holes with minor drilling on the reciever for the set screws to catch .

The above two were used on factory 03A3 rear sights to get them to stay on .

Drill a small pigsty through the sight and the reciever to put in a small pin . You could do this with a bullheaded pigsty , only then you'd have to drill out the pin to remove the sight ....but how oftentimes do you need to do that ?

Chris


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#xiii emmagee1917

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Posted 05 April 2016 - 01:55 PM

Oh , do NOT try to pound down the upper edges of the dovetail on this rifle . The metal is very difficult and brittle . Ok to punch , but not wide spread hammering . Remember all those people who tried to pinch the ii legs together to concur the triggerhousing tighter ? Call back all those recievers with a cleaved off or rewelded ( ok , welded ) leg ? Enough said.

Chris


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#fourteen jim c 351

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Posted 05 April 2016 - 01:58 PM

Chris,

Cheers for the comments , but it fails to accost the issue of why is this happening.

Jim C


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#15 emmagee1917

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Posted 05 Apr 2016 - 02:07 PM

I would guess that the staking was not skillful enough or the dovetail cut in the reciever was a tad too big or the rear sight dovetail likewise small , allowing movement , which led to battering , which led to more movement ....on and on till the movement was great plenty to exist noticed.

I don't for a moment think that a reciever would streach through that surface area....too thick and no pressure .

Chris


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#16 ron_brock

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Posted 05 April 2016 - 08:51 PM

Remember all those recievers with a broken off or rewelded ( ok , welded ) leg ? Enough said.
Chris

:-)

Ron

Edited by ron_brock, 05 April 2016 - 08:52 PM.

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#17 Got Uzi

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Posted xviii April 2016 - 09:36 AM

Jim-

I just replaced a carbine slide on a friends M1 Carbine and noticed that the rear sight was very heavily stalked.  I did annotate that the op rod spring felt weak when I looked at the M2 in question.  I wonder if it is being caused by excessive recoil and battering the back of the receiver-causing it to loosen up?


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#18 jim c 351

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Posted xix April 2016 - 12:01 PM

John & Atlas 64,

Last calendar week I got some other chance to work on the carbine.

The operating slide spring was 3/eight inch below specks and the shooter was shooting gunshow reloads.

SO- following atlas64 advice I installed a proper length spring and advised owner to shoot only manufactory ammo.

I filed another staking notch on the rear sight, and using the .0015 inch shim and double coating of Loctite & I restaked the sight.

Suggested owner consider buying a new Wolfe spring.

Now we tin can simply hope for the best.

Again,--thanks to all who replied.

Jim C


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Source: http://www.machinegunboards.com/forums/index.php?showtopic=19282

Posted by: hiltonsteepire.blogspot.com

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