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Stock ferrule clearance

This is a discussion on Stock ferrule clearance within the Gunsmithing forums, part of the M14 M1A Forum category; I have a question. I have no clearance between the stock ferrule and the plate that butts up against the gas cylinder. I was wondering ...


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Old March 12th, 2017, 07:49 AM   #1
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Stock ferrule clearance

I have a question. I have no clearance between the stock ferrule and the plate that butts up against the gas cylinder. I was wondering if I could mic the depth front to back of the ferrule and take .010 off the back side by pushing it back and forth on fine sand paper taped to a flat piece of glass, and remove a like amount from the front horseshoe on the stock? If not, does anybody have any better ideas? I also can't get that @#$%$ op rod out too!

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Old March 12th, 2017, 08:18 AM   #2
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The horseshoe on the stock is called the ferrule.

The part on the barrel/gas cylinder is called the front band.

No clearance is better than too much. You should be able to slide a business card in there. If you actually see wear on the face of the ferrule, I would slightly shim the gas cylinder, assuming your lock isn't too tight.

If you don't see any finish wear, then just put a dab of grease on it.

As for the oprod, tape up a large, flat head screwdriver. Insert it in between the receiver and the oprod block. Gently pry the top of the oprod block away from the receiver while tapping up on it with a synthetic or wood mallet.

The dismount notch in the receiver rail usually has a slight "shelf" to it, making new oprods difficult to remove.

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Old March 12th, 2017, 08:41 AM   #3
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I shimmed the gas cylinder, still touching. So I will just grease the front of the ferrule and the tang and see how it shoots. When I bed it I can probably get the clearance then. Thanks!

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Old March 13th, 2017, 11:19 AM   #4
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Binding between the ferrule and barrel band will cause inaccuracy. There should be about .010" clearance between them. Even with clearance, grease should be applied between the lip of the band and the bottom of the ferrule. This allows free movement of the band to recover from recoil and torque forces encountered during the firing cycle.

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Old March 14th, 2017, 03:24 AM   #5
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Wow thanks ptaleo for a great question and thanks Ted Brown and KurtC for the clinic ,when you guys weigh in I always reed .

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Old March 14th, 2017, 05:03 AM   #6
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Well, I went ahead and glued the ferrule to the stock, hogged it out to NM specs, relieved the contact between the gas cylinder and stock, shimmed the GC, still has contact. I will try it and see how it shoots, and then maybe remedy the situation with glass bedding later on down the road.

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Old March 14th, 2017, 05:04 AM   #7
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Unless there is another fix I am not aware of?

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Old March 14th, 2017, 05:43 AM   #8
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If there is so much contact that there is a problem, the stock won't pivot on to the barreled action. If the stock goes on without force, you should be OK.

Tell us more about the rifle/parts.

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Old March 14th, 2017, 04:52 PM   #9
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It is a 97 model M1A loaded. It has the stainless steel medium heavy barrel, the Winchester bolt off Rod GI trigger parts except for the housing, GI gas cylinder and sights from Windy City sourcing.
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Old March 14th, 2017, 04:57 PM   #10
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A bedding job will fix that.

Tony.

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Old March 14th, 2017, 04:58 PM   #11
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Stock ferrule clearance

How many rounds does it take for the action to settle in the stock after being removed? I was thinking about using it in a match in OKC this weekend.

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Old March 14th, 2017, 05:02 PM   #12
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Quote:
Originally Posted by tonyben View Post
A bedding job will fix that.

Tony.
With good ammo and me doing my part, do you think it will hold the 10 ring?

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Old March 14th, 2017, 05:46 PM   #13
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Quote:
Originally Posted by ptaleo View Post
With good ammo and me doing my part, do you think it will hold the 10 ring?
A 10 ring is 3 moa. Any M1A will do that, even in a cheap polymer stock. You need to worry about the guys holding the X ring, which is about 1.5 moa.

How was the front band clearance with the original gas cylinder?

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Old March 14th, 2017, 06:56 PM   #14
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A 10 ring is 3 moa. Any M1A will do that, even in a cheap polymer stock. You need to worry about the guys holding the X ring, which is about 1.5 moa.

How was the front band clearance with the original gas cylinder?
As far as I know. If it accidentally shoots better than I fear, I will shoot it at the CMP EIC at OKC April 6th. I am going to take it to the range tomorrow after work or Friday and see how it does. I still have a couple of weeks to bed it if it doesn't.

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Old March 14th, 2017, 07:11 PM   #15
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XM25 build front band clearance excessive ?

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