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Accuracy potential of USGI fiberglass stocks

This is a discussion on Accuracy potential of USGI fiberglass stocks within the The M14 forums, part of the M14 M1A Forum category; Do USGI fiberglass stocks have the potential to be as accurate as a bedded wooden stock? If so, does the USGI fiberglass stock have to ...


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Old April 19th, 2017, 09:05 PM   #1
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Accuracy potential of USGI fiberglass stocks

Do USGI fiberglass stocks have the potential to be as accurate as a bedded wooden stock? If so, does the USGI fiberglass stock have to be bedded, or is bedding even possible with that stock?

I like the rigidity and stableness of a fiberglass stock, but I really don't feel like dropping several hundred dollars on a McMillan right now. Hence, my question above. And I have to admit that my knowledge and/or experience of what it takes to properly bed a rifle is sorely lacking.

So will a USGI fiberglass stock allow the rifle to shoot its best, with or without modifications?

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Old April 20th, 2017, 04:50 AM   #2
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In my opinion & experience a good & tight USGI fiberglass stock will make a good shooter out to 200 yards as is, the main issue with them is the rigidness of the forearm. If you want to do it right, you should have your gas assembly unitized or shimmed to the front band, and it's ears turned up so the handguard doesn't rattle or rub atop the stock. You can fashion your own holding fixture & tool do a simple (Skim) bed with a slow setting (Steel) epoxy, you'll want to put a generous amount of epoxy in the forearm channel from the action bedding to the front ferule and smooth it out to ensure it clears the op rod & guide, this will make the stock & forearm rigid. The whole purpose here is to get upward barrel tension against the front band's lip and stock ferrule.

I've turned a couple GI rifles into MOA shooters doing it this way.




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Old April 20th, 2017, 04:56 AM   #3
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So will a USGI fiberglass stock allow the rifle to shoot its best, with or without modifications?
No. All they were designed to be was a standard stock that doesn't rot. The accuracy requirement was the same as an unbedded wood stock, which was something like 5 moa.

They are basically two hollow halves that are epoxied together, often not very well. They can be twisted or warped, even when new. Your barrel may not even be centered down the channel.

That being said, sometimes you stumble across a nice one, with tight lockup and nice even fit. Some folks have reinforced them on the inside with fiberglass rods and strips, claiming better accuracy. I believe that the AMU tried some tricks with these decades ago and gave up, seeing no merit in the idea.

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Old April 20th, 2017, 05:00 AM   #4
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GI fiberglass stocks can be made into great accurate stocks with some work. Some people reinforce the forearms with carbon fiber arrow shafts or simply fill in the forearm with epoxy.

Jon Wolfe goes farther and reinforces the forearm and the area of the stock that encases the receiver surfaces.

In my opinion, the barrel is the biggest contributor to accuracy. I've pulled off some great groups with the Jon Wolfe 5R barrel in a GI fiberglass stock multiple times with multiple rifles.

Tony.

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Old April 20th, 2017, 07:04 AM   #5
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The stock will be for my upcoming XM21. I didn't pay much for the fiberglass stock I have, so I may try to experiment on it and try to stiffen it up with some of these suggestions. If it works, great. If it doesn't, then I'll look at maybe getting a McMillan later.

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Old April 20th, 2017, 07:55 AM   #6
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For what it's worth, I swapped the wood SAI stock on my M1A for a GI fiberglass stock. Didn't notice any accuracy changes one way or the other.

Mind you, I don't shoot over 200 yards, nor have I ever been fanatical about accurizing, so my standards might be different from yours.

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Old April 20th, 2017, 07:59 AM   #7
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Quote:
Originally Posted by mc89 View Post
The stock will be for my upcoming XM21. I didn't pay much for the fiberglass stock I have, so I may try to experiment on it and try to stiffen it up with some of these suggestions. If it works, great. If it doesn't, then I'll look at maybe getting a McMillan later.
Assemble the rifle without a handguard. See how well the barrel centers thru the stock ferrule. Also see how close the ferrule is to the front band. You would want a gap about the size of a business card in order to have usable draw pressure.

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Old April 20th, 2017, 08:11 AM   #8
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I have a FG stock from Sumo. It's a VanDerStaak Camo and he used the best FGstocks Fred had. I would say it's more accurate than any of my wood stocks , no bedding in both wood and FG cases. Draw pressure, lockup, and alignment are perfect.


So I think it's a matter of getting a good FG stock to begin with. But I don't sling up supper tight on it in general and that could come into play. It seems very stiff to me.

Pop a 5r on it and sure it would be better.

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Old April 20th, 2017, 08:31 AM   #9
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I used the carbon fiber arrow shafts in a glass stock. It stiffened it up quite a bit and eliminated the flexing associated with the hasty sling. I just used epoxy and it was fine.

You can usually skim bed the area of the stock where the pads on the trigger group mate up and get better lockup in older wood stocks that show signs of compression.

It is simple and effective, just be sure you don't bond the TG in permanently. There are tutorials around the forum.

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Old April 20th, 2017, 10:45 AM   #10
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USGI synthetic stocks are the only ones I have on my rifles. I have modified them slightly by filling in the selector holes and the voids in the receiver area with PC7 steel epoxy. Also used PC7 to line the sides and bottom of the forend. Do not go more than 1/8 inch deep in the bottom of the forend or the oprod will bind.

Though this will add about 1 pound of weight, it stiffens the stock and gives it a very solid feel. I like PC7 because it has very strong adhesion, much better than Brownells Steel Bed.
Above describes what I do to stiffen my USGI synthetic stocks. Below is a link to thread about Jon Wolfe's stocks:

Jon Wolfe Mod-Fib stock review...

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Old April 20th, 2017, 10:51 AM   #11
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To avoid any marks, gouges, scratches, to my custom walnut M14 LRB stock purchased a nice one from fellow member for just casual shooting at my local range or for coyote hunting soon to take place and w/ LC brass, Fed. 210M primers, 41.8grs of IMR4895, Sierra 150gr. bullets(not match grade) the rifle w/ GI glass stock gives routinely 2moa @ 100yds. for 5 shot groups. With the bedded NM style walnut stock gives usually around 1moa for same group and distance but using SMK 168's. With the Leupold MK 4 10X scope/Basset mnt. I can shrink those groups a bit so either one is fine for their intended purposes. The fit of the barreled action in the GI stock is snug as in the past have installed two carbon fiber arrow shafts underneath the forearm area but just been lazy these days and doubt doing so would increase the accuracy an appreciable amount, so will leave it as is. Used leaves, pine cones, twigs, to give the stock a camo paint job and easy to clean up if it gets ugly from use. Rifle using the GI stock is a bit lighter for the walnut stock is a bit oversize an you can notice the weight difference. With the NM stock it is a match rifle and with the GI stock it becomes an all around utility rifle.

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