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My official LR-308 build thread


NoFail

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Hi People, FNG here but I am in the middle of my LR-308 build and have most of the parts now. This is my 1st AR build, also my 1st AR, I have other firearms though.

So I'll just get into it & here's the list:

JDM lower receiver mostly built now

JDM 14" tube hand guard

JDM Picatiny rails one 6" three 3" for the hand guard

Magpul UBR, MIAD Grip & AFG all in FDE. I stippled the AFG already

Slash's CAR10-HX buffer with modified AR-10 spring.

Smith Enterprises Vortex flash hider

Phase 5 Tactical EBRv2/308  extended bolt release

POF ejector port door

RADDLOCK magazine release button for California b.s. law. This button can be easily converted to work like your non Ca. b.s. law button with a simple tool  ;)

JP EZ fire control system with safety selector. Installed in lower now, very nice working trigger and smooth as silk safety selector too.

JP Low Mass Carrier .308

JP bolt carrier completion kit

JP low profile adjustable gas block

JP mid length gas tube

Fulton Armory selected lower parts and upper port door pin, C clip & spring too

BCM Gunfighter Mod 3 Charge Handle

What is ordered but I'm waiting.

JDM upper .308  Two more weeks so they say

JP Supermatch barrel 16" stainless .308, add 50 bucks for their black Teflon coating hope that looks good. Didn't want the standard polished stainless finish look.

JP Enhanced Bolt .308

JP parts hopefully only 3 more weeks now like they say.

Of course without pics I'm a dirty liar,  sooooo....  <munch>

post-1757-136297273044_thumb.jpg

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That carrier is so far from chrome-looking - do you have better pics of it, in a different light?  That's black as all days in the pic of it that you posted.  <dontknow>

Yes 98Z5V I hear you brother. I stated chrome I should have said stainless my bad. I tried to get a decent pic but the lighting and then the flash I couldn't get it done. It has the oil on it that it shipped with too didn't want to clean it yet.

But here's part of what JP has to say about their product, from their online store;

"You may be wondering why our stainless carriers appear black. This is due to a new state of the art surface finish for stainless called QPQ (Quench, Polish, Quench). This is a five-step process resulting in a rock hard surface with natural lubricity. Some want the bright polished look and that is available on the JPBC-3 Low Mass carrier, but not the JPBC-2 tactical carrier.

The JP LRP-07 has our large format AR-10 type Low Mass carrier. The JPBC-4 AR-10 low mass stainless bolt carrier is also finished in black QPQ hard coat for superior wear and natural lubricity. The JPBC-4 will also improve the sight recovery on the DPMS LR-308 or the Armalite AR10. However, it must be used with a DPMS LR-308 bolt assembly, firing pin, cam pin and firing pin retainer."

Here's the link, with good pics too, to that page    http://www.jprifles.com/1.4.7_bc.php

And yeah they want $259.95 for that carrier, so I paid them  :cookoo:

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Okay thanks, Robo. And I am using the JP adjustable so.... Oh Boy I can hardly wait now, so close. I gotta tell you guys this is all I have been thinking about, you know? Yeah you know, I know you know, LOL!!! Like, wife just went to bed... who the hell cares  <lmao> I'm right here sharing with you guys I can't get enough. So I got some more stuff for you guys some of you might be interested or not  <dontknow> Next post you'll have it.

Thanks Robocop  <thumbsup>

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Guys is this hole common in lowers? the hole in my receiver is tapped 6-32 too. Threads start 1/4" inside hole and end after another 1/4" or so. I used this option because MIAD doesn't seem to be good for the takedown detent spring. But I'm glad that other hole is there and it's threaded, I used 6-32 set screw and loctite'd it with 242.

post-1757-136297273366_thumb.jpg

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I don't get it brother NoFail whats with the tuna key? <dontknow>

OMG you're right brother unforgiven it is a tuna key LOL!!!! It's a tool to put the button into California mode or everywhere else mode. The button adjusts in & out of the receiver. Adjust button low in receiver and it's Cali mode. Adjust 2.5 -3 mm higher and you're in anywhere else mode because it will now work just like brother unforgiven's button will work.

AWE never mind bro, this state is occupied by a bunch of idiots!!!!

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Hello NoFail.... That is going to be one very sweet looking beast when it is all put together. Very much like my next anticipated build of a battle rifle. JD/JP combo is the way to go in my experience. You have selected great top quality parts through out. I have got more than a 100 rounds through the rifle now and no real signs of any finish wear on the bolt carrier. I do use Slipstream lubricants from Crusader rifles (expensive but I think it does do a better job... at least I hope it does).

One thing I did notice in disassembling the bolt last night was the firing pin retention pin was bent a bit so you may want to get a spare and make sure you do have the drift punch and appropriate hammer to take it out and if need be get it pack in again cleanly. I didn't realize the gasses actually port back into the bolt assembly (still learning about how that technology all works together), and man that was filthy after 60 rounds on the weekend. I seriously want to get an ultrasonic cleaner for cleaning these parts well between firings. I also started to notice that it wasn't cycling completely every time after about 40 rounds, more gas didn't really help. It was pretty wide open already. I think my Tubb flat wire spring may have more compression force than the usual springs (But with that Slipstream grease worked in it is pretty quiet and I like that).

Your barrel twist should be perfect for the heavier loads. My 6.5 has a 1 in 8 twist but the long skinny bullets need need more spin to stay stable through out their flight. For the lighter range bullets they would be over stabilized (below 120gr in my case).

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