M1A bolt hold open issue

M14s, M1 Garands & Carbines, Enfields, M1903s
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hurricanecharlie
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M1A bolt hold open issue

Post by hurricanecharlie » Sun Jan 24, 2016 8:29 pm

Without mag in the gun can get bolt catch to catch the bolt but almost immediately bolt slams forward.

What to replace first?

Op rod spring? It is quite old. Not enough pressure to hold bolt?

"catch"? to my semi trained eye looks to be intact

"Catch spring" This seems least likely to me

gun runs well with this being only issue

](*,)

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Racist Infidel
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Re: M1A bolt hold open issue

Post by Racist Infidel » Sun Jan 24, 2016 9:21 pm

Without having the gun in hand this is only a guess. As the bot will catch the hold open but does not stay there, first thing I would look at is the hold open. Are the mating surfaces rounded?

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flcracker
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Re: M1A bolt hold open issue

Post by flcracker » Sun Jan 24, 2016 10:25 pm

Does it hold open with an empty mag in the rifle? What happens when the mag is removed?
and some rin up hill and down dale, knapping the chucky stanes to pieces wi' hammers, like sae mony road-makers run daft - they say it is to see how the warld was made!

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Dave P
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Re: M1A bolt hold open issue

Post by Dave P » Mon Jan 25, 2016 10:54 am

Sounds like it has to be a worn bolt stop...

But easy enough to order a new one for comparison.

BIG WARNING: it is easy to crack the ears that hold it, if you try to replace the bolt stop. They are an integral part of the receiver - be careful!
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hurricanecharlie
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Re: M1A bolt hold open issue

Post by hurricanecharlie » Mon Jan 25, 2016 6:00 pm

bolt does not stay back on empty mag

I did see on a site that weak op rod spring can cause this

bolt will stay back with empty mag and you press down the bolt hold open lever

remove mag bolt goes forward

smacked the butt with my hand and bolt did not go forward with mag in the gun

#-o

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Racist Infidel
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Re: M1A bolt hold open issue

Post by Racist Infidel » Tue Jan 26, 2016 1:11 am

hurricanecharlie wrote:bolt will stay back with empty mag and you press down the bolt hold open lever remove mag bolt goes forward.
I have edited your post to include punctuation. Does my edit reflect what is happening with your rifle?

If it does, the rifle is acting like it should.

1. The bolt stays open with an empty mag.

2. When you push the bolt release and pull the mag the bolt closes.

Put an empty mag in the rife. Pull the bolt back. Will the bolt stay open?

Remove the empty mag. Does the bolt stay open?

Press the bolt release. Does the bolt go forward?

hurricanecharlie
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Re: M1A bolt hold open issue

Post by hurricanecharlie » Tue Jan 26, 2016 11:17 am

I am piss poor typist. Apologies.

Bolt hold open should keep the bolt held back without magazine, or so I thought.

It does not. Holds for a moment , when applied manually,then slams forward.

My thought was, after reading some things , old op rod spring was not keeping sufficient tension against the hold open.

:ber

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Racist Infidel
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Re: M1A bolt hold open issue

Post by Racist Infidel » Tue Jan 26, 2016 8:53 pm

Unless the spring is worn down from abrading against something, springs do not get weak. The failure mode for springs is by fatigue failure. When was the last time you changed the springs under your car?

I would check the mating surfaces of the bolt and the bolt hold open. You are correct, the hold open should hold the bolt back on an unloaded mag.

hurricanecharlie
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Re: M1A bolt hold open issue

Post by hurricanecharlie » Wed Jan 27, 2016 8:11 am

Springs do get weak.
It is usually referred to as metal fatigue.
Op rod spring tension is not the issue since putting hand pressure forward on charging handle/op rod bolt still closed after engaging the hold open manually.

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