Correct Length for LR-308 Buffer Tube

[majordon]

Not sure about the configuration you are referring to. If you mean with the BCG locked back in the buffer tube, that is currently the problem. With the spring I am using, I am unable to lock the carrier back, either with mag installed or manually.

[Dane Armory]

Like this !

[majordon]

Hope this is what you were talking about. It may not be apparent from the photos, but the face of the bolt clears the bolt catch by about 1/8" to 3/16".

[98Z5V]

Have you shot this rifle yet? 

 

I think you're trying to hand-cycle it, it's never been fired, and the buffer spring wasn't locked onto the buffer.  Sometimes, you need to work for a minute to seat the spring on the buffer.  I'm betting it's not seated on the buffer, thus causing extra length, and you can't lock it back by hand.  The first round down the barrel will seat it, i guarantee that.

 

That paint is badass, by the way.

Edited March 26, 2015 by 98Z5V

[survivalshop]

  I agree , the paint is badass !  

 

 If your spring is not seated as those photo's show , you can twist the spring like a screw , to seat it , or should , I might say .

 

image_1b.jpgimage_2b.jpgimage_3b.jpgHope this is what you were talking about. It may not be apparent from the photos, but the face of the bolt clears the bolt catch by about 1/8" to 3/16".

 

   Is there any Buffer or Spring in the Receiver Extension , in those photo's ?  

[Dane Armory]

Yes... that is what I needed to see !

As 98 & SS pointed out , it appears the spring is not seated

.

I think you are over thinking this and should just shoot it and the parts will mate.

BTW nice paint job.

MikeH

[majordon]

Thanks to all of you for your input and insight. I think what I need to do now is make sure I have the correct length spring and send a few rounds down range. I am attaching some photos of the finished product.

[shepp]

What color is that on the upper and lower? That's fuk'n Hawt!!!!!! Go shoot that bad bitch!!

[majordon]

Well, Juggernaut Tactical calls it FDE, but it's not like any FDE I've ever seen. I call it bronze or golden bronze, but it is pretty cool!

[washguy]

Calling Major Tom calling Major Don   come back in the capsule      Its not the buffer tube..seat your spring...its your Juggernaut billet matched ultra throwdown upper/lower thats maybe fubared...I refer you to youtube  juggernaut issues 1,2,and 3...maybe thats the problemo too?

     :) Wash

[majordon]

Thanks, Wash, I'll check that out.

[FaRKle!]

I just counted the coils on my buddy's G2 Recon, yup 29 coils.

[majordon]

Thanks. That's what I count on mine as well.

[98Z5V]

majordon, do us all a favor and quit fucking around with your font size.  Don't post that small schit.  This is for your benefit - if people have to squint to see what you're trying to get across, then most people will just blow it off.

 

Take that for what it's worth, but you're effing yourself in the aaaay with the midget-font.

 

Thanks.  <thumbsup>

Edited March 27, 2015 by 98Z5V

[bubbasks]

[survivalshop]

Calling Major Tom calling Major Don   come back in the capsule      Its not the buffer tube..seat your spring...its your Juggernaut billet matched ultra throwdown upper/lower thats maybe fubared...I refer you to youtube  juggernaut issues 1,2,and 3...maybe thats the problemo too?

     :) Wash

 

 

 

   Try to diagnose a problem & find its how the components were made , not to normal spec's like the rest of 308AR's . If you can call anything,  normal , for 308AR's . <dontknow>

 

  Edit ; The videos I looked at talked about the charging handle fitment , is that what you are referring to ?

Edited March 27, 2015 by survivalshop

[washguy]

I didnt pay much attention to vids just watched the first lil bit of the first one...thought it might help?

:) Wash

Edited March 27, 2015 by washguy

[gsmopar]

Remove the spring and slide the buffer and BCG into the tube and make sure it clears the bolt catch.  If it does, add the spring and repeat.  I had one that was REAL tight and made it very picky on ammo:

 

[majordon]

Thanks, I'll give that a try.

[CorpsTex]

On 3/23/2015 at 7:16 PM, majordon said:

What is the proper length for an LR-308 buffer tube? I am using a 7" mil-spec tube with DPMS 308 buffer and spring. My problem: I can't get the bolt to lock back; it appears that the the bolt doesn't trravel far enough to allow the bolt catch to activate.

 

Anyone have any opinions on this or as to what I might do to correct this?

 

Thanks from a new member. Majordon

 

[CorpsTex]

Your buffer is too long, I have a few AR10's. The correct overall length of your buffer should be 5.300 inches. With a overall spring length of 12.5". I encounter the same problem during my second build. Bolt carrier would not properly latch on the bolt catch. These builds are both rifle length builds not carbine with Magpul full length rifle stocks with extended recoil pads attached.

Edited April 4, 2020 by CorpsTex

[Armed Eye Doc]

1 hour ago, CorpsTex said:

Your buffer is too long, I have a few AR10's. The correct overall length of your buffer should be 5.300 inches. With a overall spring length of 12.5". I encounter the same problem during my second build. Bolt carrier would not properly latch on the bolt catch. These builds are both rifle length builds not carbine with Magpul full length rifle stocks with extended recoil pads attached.

Welcome to the forum.  Look up the introduction section and tell us about you and your rifles.  More gun porn never hurt our forum.

[shooterrex]

And that thread was 5 years old.

[98Z5V]

11 hours ago, CorpsTex said:

  On 3/23/2015 at 5:16 PM, majordon said:

What is the proper length for an LR-308 buffer tube? I am using a 7" mil-spec tube with DPMS 308 buffer and spring. My problem: I can't get the bolt to lock back; it appears that the the bolt doesn't trravel far enough to allow the bolt catch to activate.

 

11 hours ago, CorpsTex said:

Your buffer is too long, I have a few AR10's. The correct overall length of your buffer should be 5.300 inches. With a overall spring length of 12.5". I encounter the same problem during my second build. Bolt carrier would not properly latch on the bolt catch. These builds are both rifle length builds not carbine with Magpul full length rifle stocks with extended recoil pads attached.

Sorry, @CorpsTex, but your information is not correct.  We've come a loooong way in buffer-work on this board since 2015, when this thread was started, and finished.

He clearly stated that he had a 7.000" internal depth receiver extension, so that's an AR15 Carbine Receiver Extension.  To function on a .308AR, that extension must use a 2.500" long buffer.  Buffer weight is another matter that we've gone through here, through the years.

Now, if he was using a Rifle Recoil System, that receiver extension would have an internal depth of 9 11/16" (both .308AR and AR15, and both varients of AR15, being A1 and A2 stocks - exact same Rifle receiver extension), and he'd have to use a buffer length of 5.200" long - not the 5.300" long, that you stated - that extra 0.100" makes a BIG difference on alot of these builds, believe it or not.  That extra 0.100" (depends where you put it) can make your gun run like a dream, or completely fornicate-up.  Having it in buffer length, when it's supposed to be 5.200" long - is not a great idea. .308AR Rifle Buffers are 5.200" long.  AR15 Rifle Buffers are 5.900" long.  If your buffer is different from that - then who made it?...  It's not what it's supposed to be, I'll tell you that much...

But that doesn't matter - he had a Carbine Recoil System.  You're referencing (loosely) a Rifle Recoil System.

Now, on that Rifle Recoil System, you're telling him that he needs to have a spring length of 12.50".  What's the wire diameter of that spring, and the coil count?  The best spring to run on a .308AR Rifle Recoil System is the Armalite EA1095 - they pioneered it, they make it the exact same every single time, and they QC it.  It's the best "factory" spring that you can possible buy.  And it measures:  34 coils at 0.072" wire diameter, 13.750" long, relaxed length.

So, I have to ask - who made your spring, and do you really know it's right?  It's nowhere close to what the original designer of this rifle made, and stated was "correct" for a Rifle Recoil System.

I'll agree with your assessment that his buffer was too long - it was probable an AR15 Carbine buffer, at 3.250" long, and not a DPMS LR-308 CARBINE buffer, that should have been 2.500" long.  That was probably it.  The rest of your data is off, and I don't want to see others here (new people) repeating it, and stating it as fact.  Hope you understand that. 

Edited April 4, 2020 by 98Z5V

[CorpsTex]

Better check with Aero Precision, they sell the correct buffer, buffer spring and buffer tube for a rifle length AR10. This will allow the correct bolt hold back when the magazine is empty. And yes the overall buffer length is between 5.3 to 5.5" long for proper bolt operation