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Buffer Tube Threading?


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#1 Brigg

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Posted 26 November 2012 - 07:00 PM

Does anyone know if the threading on the LM4 is at all compatible with a RS buffer tube? I've been wanting to install a full sized A2 rifle stock on mine.

Of course I would hate to buy everything to find out it wont screw on. So does anyone know if the threading is compatible at all?

#2 netpoc

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Posted 26 November 2012 - 07:04 PM

It is not. I tried a real steel castle nut (buffer tube nut) and the threading was very different.

#3 Brigg

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Posted 26 November 2012 - 09:20 PM

Well, Crud. there goes that idea.

#4 electroburst

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Posted 07 April 2013 - 02:11 PM

Having just installed a Magpul PRS stock on one of my real AR-15 lowers (which uses the same buffer tube as an A2 stock, and very similar retention system) I can tell you that it doesn't need a castle nut. I'm considering the LM4 for training purposes if it will accept a RS full length buffer tube and hope someone else will chime in as to weather the lower reciever threading is the same (NOT the threading on the outside of a carbine buffer where the castle nut goes) Thanks for asking the question Brigg and I hope someone else has the answer.

#5 akiraspeedstar

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Posted 07 April 2013 - 02:58 PM

Holy sh*t, the dead area rising.

#6 netpoc

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Posted 07 April 2013 - 05:35 PM

Wtf? The threading is the same on the castle nut as the receiver.  Think about it...

#7 BeachEMT

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Posted 07 April 2013 - 05:39 PM

Hey electrobust, just so you know the castle nut threading is the same as the receiver threading. There's no possible way for two parts that attach to the same threads to have different threading. The LM4 does not accept RS buffer tubes.

Edit: sorry netpoc, you posted while I was typing.

Edited by BeachEMT, 07 April 2013 - 05:40 PM.


#8 netpoc

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Posted 07 April 2013 - 06:07 PM

Lol, it's all good.... I was like WTF? Huh?

#9 ky2970

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Posted 08 April 2013 - 04:10 AM

To install a full A2 stock, you could try looking for a GBBR rifle receiver extension like the ones made by Viper. I can't guarantee 100% compatibility but I'm sure with some light modification, it'll go right on. I had to slightly sand down the threading for my UBR stock's receiver extension to get it to fit and it works fine now.

http://shop.ehobbyas...4-gbb-tube.html

#10 electroburst

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Posted 08 April 2013 - 04:23 AM

Ahh, I see now. Haha. Not enough sleep these past few days. Since a different buffer tube on the LM4 lower is out of the qestion, I'm wondering if anyone knows if I could just substitute a real lower receiver.

#11 BeachEMT

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Posted 08 April 2013 - 08:35 AM

This question has been answer too many times to even count. Just scroll down the front page and you will find a couple discussions on this.

#12 ky2970

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Posted 08 April 2013 - 09:26 AM

No you cannot substitute a real lower. And trying to put a full auto sear into a real lower can get you in serious trouble with the ATF...

#13 BeachEMT

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Posted 08 April 2013 - 08:49 PM

Am I the only one who's getting fed up with people not doing any research before posting? Something as simple as non-OEM receivers has been talked about a million times on this forum. All it takes is reading through one of the stickies to get that info or just scrolling down the front page. If you have a question about 3rd party compatibility, the first place to start is the 3rd party compatibility sticky.

#14 netpoc

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Posted 08 April 2013 - 08:54 PM

You, me, and everyone else.

#15 BoobieM4H

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Posted 08 April 2013 - 11:20 PM

View Postnetpoc, on 08 April 2013 - 08:54 PM, said:

You, me, and everyone else.
Lol..yup

( o Y o )






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