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Intro - Build


cas0586

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Hello,

New here to the forum. Made a post in the trigger section already but thought an intro was in hand.

This is my first LR-308 build. I started my black rifle collection with a S&W M&P15-22(customized it a little). Then purchased a S&W M&P 15-22(slightly customized) for a fun cheap little plinker. Next I snapped together an AR chambered in 7.62x39 using a complete blem PSA magpul complete lower and a Daytona Tactical complete 7.62 upper. Only chnage on the 7.62x39 was an enhanced firing pin for better reliability. All of these rifles shoot very well. So decided to build an LR-308 for a bench rifle and perhaps a couple hunting outings a year. This is mainly a 'budget' rifle 'build'. Build used in the broad word as prices for complete/uppers and really hard to beat these days building from scratch. That being said here are the components of my build I have purchased thus far.

Tennessee Arms Populated .308 Lower - Yes, I was willing to give polymer a shot. The lower comes populated with a standard LPK.
Alexandria PRO-FAB .308/7.62X51 Upper Receiver Group 18in. Barrel

  • 416R Stainless Steel 1/10 TWIST
  • NITRIDE BCG – 9310 BOLT
  • MUZZLE DEVICE – A2 BIRDCAGE
  • GAS SYSTEM – MID LENGTH

Luth LR-308 MBA Modular Stock w/DPMS Buffer Assembly Kit
SureFire Pro Comp Muzzle Brake
Vortex Crossfire II 4-12x40 AO BDC 

PMAG 20 LR/SR GEN M3 - Will likely swap for ten rounder

 

So I still yet need to pick out a scope mount and a decent trigger. I figure I will use a Giessele G2S.

 

BTW, not sure if this is a forum wide problem, but I have to reset my password every time to login.

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  On 11/21/2016 at 9:11 PM, MikedaddyH said:

Welcome from AZ !

I have wanted  Tennessee Arms polymer lower since they were introduced .When it done take a picture . Could you weigh the lower ? Thx

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I can certainly do that. I have not received the lower as of yet. I ordered on the 7th and there is a 4-5 week back order due to the facility change/election. My order currently states 'Awaiting Shipment'. Where previously it said fulfilling order. Would hope to get it soon. I ordered black but I guess all the other .308 lower colors are available. They claim 14 oz. with LPK installed.

Right now the upper looks like this:

tbBDKntl.jpg

 

Edited by cas0586
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  On 11/21/2016 at 10:47 PM, MikedaddyH said:

Nice ! 12" Handguard ?

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It is a 15" handguard over 18" barrel.

  On 11/21/2016 at 11:46 PM, unforgiven said:

Just looked them up pretty impressed with the product line.:thumbup:

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I will certainly report back. I am sure someone here has had to use them before though. Perhaps not though!

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  On 11/22/2016 at 12:08 AM, cas0586 said:

It is a 15" handguard over 18" barrel.

I will certainly report back. I am sure someone here has had to use them before though. Perhaps not though!

Expand  

Necessarily ! 12" Handguard ?

I have touched one by have not built the lower. Looks good with the metal inserts around the holes.

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  On 11/21/2016 at 9:11 PM, MikedaddyH said:

I have wanted  Tennessee Arms polymer lower since they were introduced .When it done take a picture . Could you weigh the lower ? Thx

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Take a look at my TNArms build in the builders' section. Weight is there.

When using the TNArms polymer lower, be aware that you are going to need anti-walk pins for the fire control group. The polymer is slick enough that the pins are going to walk out on you. Other than that, I really like my TNArms poly lower.

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  On 11/23/2016 at 1:29 PM, mineralman55 said:

Take a look at my TNArms build in the builders' section. Weight is there.

When using the TNArms polymer lower, be aware that you are going to need anti-walk pins for the fire control group. The polymer is slick enough that the pins are going to walk out on you. Other than that, I really like my TNArms poly lower.

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Thanks for the input. Since I am planning on using the Geissele G2S trigger I emailed them about using anti-walk pins. They said even in polymer if installed correctly it is not an issue.

"We only  recommend Geissele pins with our triggers. If your G2S is installed correctly you won’t have issues with your pins walking. Please feel free to contact us with any further questions."

So try it out first and see I would presume.

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  On 11/23/2016 at 6:46 PM, cas0586 said:

Thanks for the input. Since I am planning on using the Geissele G2S trigger I emailed them about using anti-walk pins. They said even in polymer if installed correctly it is not an issue.

"We only  recommend Geissele pins with our triggers. If your G2S is installed correctly you won’t have issues with your pins walking. Please feel free to contact us with any further questions."

So try it out first and see I would presume.

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Of course they're going to say that, ford isn't gonna tell you to use aftermarket parts

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  • 3 weeks later...

It took the full five weeks to receive the TNArms .308 lower. I brought it home, dropped in the Giessele G2S trigger, put on the receiver extension, inserted spring, buffer, slid on the Luth AR MBA stock and screwed on the palm swell grip.

AUdp55il.jpg?2

Then I slapped the Alexandria Pro Fab upper on it. Did a function check and found the first issue. The bolt will occassionally lock back on an empty mag. When it does lock back as soon as the mag is released the bolt flies forward. I cannot manually lock the bolt without a mag in the mag well. I can feel it try to grab but it does not catch. Now there is a little bit of play in the mag well. I would condemn that as being the problem but since it does not work when manually trying to lock the bolt back manually with the catch I would say that is not the issue. There is a fare amount play in the bolt catch.

EKv85shl.jpg

brPGzrHl.jpg

k8IUrhml.jpg

I was in contact with TNArms and the response was:

  Quote
This is probably a case of the wrong bolt catch. We get AR-10 bolt catches for populated 308 builds , but sometimes the finger that catches the follower on the mag just isn't long enough. take a pic and shoot it over to me. We'll get it worked out. We are actually looking at getting extended bolt catches made when we start making blowback hammers for the TAC-9 , but finding a supplier in the meantime is an issue sometimes.
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The response was rather quick and I sent them the same images posted above. Hopefully this gets resolved quickly as well.

 

Anyways, that is the only update I have my build at the moment.

 

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Admittedly I made a dumb mistake. I checked it out this morning after a good nights sleep and realized the bolt was not going all the way back every time. It was off by just a fraction. This was due to the cheek riser on the stock. I moved it back one slot on the adjustments and now it clears perfectly. I did not have any problems afterwards. Anyways we all make mistakes. At least I do. Especially after a 16 hour day! We'll see how it goes when I get out to put some rounds through it. I will keep an eye on the bolt catch.

Here is my 'finished' LR-308

0Vqyxmnl.jpg

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