DPMS LR308 / Remngton R-25 Extraction Issues

[jmpmstr463]

Before I even begin I know there are a number of posts about this.

 

I have a Remington R-25 hat has been a project for sometime now and I have done the following.

 

Rainier Arms 20" Match Barrel

PRI Adjustable Gas Block

SOCOM 7.62 Muzzle Brake

Polished and adjusted trigger

Bravo Company enhanced extractor spring kit

MAGPUL PRS Stock

 

I have taken it out to the range a few times and it is not cycling correctly. It is accurate as I could expect shooting dime size groups at 100 yds but for the life of me I can not get it to feed multiple rounds. 

 

It will pull the case out of the chamber and drops it on the magazine during most shots, then on occassion it will eject it to the 4 o'clock position. I have a video posted on Youtube of the issue.

 

 

I feel the next step is replacing the extractor. Any help would be grealty appreciated.

 

 

[blue109]

id def. look at the extractor. if you force a round into the bolt face does the ejector have good spring pressure?

[jmpmstr463]

OPFOR:

 

Yes the ejector creates even pressure when trying to place a round or empty case into the bolt face. which leads me to be that it is the extractor.

 

I have adjusted the gas block to the point it locks back on an empty magazine and additonal 1/4 turn to possibly eliminate the over gassing issue.

Edited July 27, 2014 by jmpmstr463

[98Z5V]

Dropping mags, with recoil - looks like you could use a couple more turns on that mag catch (unless you're running a bullet button, in Cali).  Big gap in the end of that one.

[Robocop1051]

I'll bet your extractor spring it fuckered up. Tear down your bolt and see what kind of shape it's in.

If it's good... look into adding a D-ring in there as well. It's a $0.25 fix

[jmpmstr463]

98Z5V:

 

Mags are not dropping in the video it is the same shot ran 3x's (Fully Speed, 50% Speed, and 10% Speed) The issue is the round is not ejecting and seems to lose extractor engagement so it does not get to eject correctly.

 

Robocop1051:

 

I have replaced the extractor spring with a Bravo Company and used the insert and o-ring. I will break it down ths evening and check the spring.

(and may sound crazy but what are you refering to as aD-Ring)

[98Z5V]

I mis-read your first post - thought you also had a problem dropping the magazines. 

[blue109]

Dring is just a D shaped O ring, so you have that covered. I had my money on spring as well. could be that the claw itself just isn't grabbing enough lip to hold it.

[jmpmstr463]

OPFPR:

 

That is the main suspect at this point, so I think I might just invest in a JP Engineering "Enhanced Extractor" and possibly their "Enhanced Buffer" and spring pack to tune the recoil a little more so to remove any doubt it is over gased.

 

All the ideas are much appreciated.

[survivalshop]

Does Bravo Co make or offer an extractor spring for a 308  Bolt  ?

[jmpmstr463]

Survivalshop:

 

No it is their AR-15 Upgrade, as I thought it would be a cheap fix if that is what it was since this has been going on for 3 weekends now, that i why I was leaning to the JP 308 Enhanced Extractor to see if that is what it would take to fix that issue.

[blue109]

aha! unless I'm taking crazy pills, you need a 308 specific spring. the AR15 spring won't cut it. the o ring is probably the only reason you have any tension at all. id try again with a fresh 308 extractor spring before I spent money on major upgrades.

few Weeks ago a friends AR15 was doing that same thing. the extractor spring looked ok, but must have had a tiny crack. swapped with a new one and ran perfect again.

Edited July 28, 2014 by blue109

[jmpmstr463]

OPFOR:

 

Already done swapped the original spring back and put an o-ring on and noticed a considerable difference in tension but that being said I will order another DPMS extractor and spring for the spare parts box.

 

I have a lot of experience with AR-15's and built many but this .308 world is so much the same but yet so very different and I am learning all over again.

 

Thanks for the help.

[98Z5V]

JumpMaster, huh?  How many jumps?  <thumbsup>

 

88 here, 77 made it to my jump log.  56 of those were with a ruck, because it's gay to jump and not get the ruck out the door...  <lmao>

 

Hollywood jumpers are gay.  :tfg:

[FaRKle!]

This looks more like a failure to eject to me... The brass clearly comes all the way back with the BCG but then doesn't get flung out.

What happens when you hand cycle rounds?

Edited July 28, 2014 by FaRKle!

[survivalshop]

 Yes, failure to eject , appears to be jumping off the extractor to me , extractor should be pulling fired case outward , into ejection port. Could also be bolt bounce , but reads he has an adj. gas block & if adj. correctly , it would eliminate over gassing .

 

  I don't think any of my 308 bolts have anything ,but the spring with the extractor . Now the Shadow Ops one might , I have a photo of it disassembled & will check.

 

It looks like it has the rubber nipple inside the spring , but thats it .

[Toolndie7]

jmpmstr463 

 

can you give us a close up photo of your bolt face assembled ? and maybe a shot of the extractor from the side un-installed? I'll bet the claw of the extractor is not cleared enough to get a firm bite on the case.

[Robocop1051]

What color is the extractor spring insert? Blue or grey? If I remember correctly, one was a little stiffer than the otheŕ.

[jmpmstr463]

So it has been awhile since I had been able to ge to the range and yesterday I did just that.

 

Here is what I have done and now the rifle runs like a champ.

First, I replaced the extractor with a JP Enterprises unit and readjusted the gasblock replaced the buffer spring with a factory spring and also installed a KynShot Buffer. Rifle cycled and ejected as it should but would not lock on empty magazine.

 

Second, adjusted the gas block from scratch again and it still would not lock on empty mag.

 

Third, Removed the KynShot buffer and replaced it with a Armalite buffer 1.5oz heavier than the factory and presto it locked on an empty, now readjusted the gasblock and it cycled 150 rounds no failures keeping a consistant 1/2" group at 100yds.

 

No I am a happy camper and looking forward to completeing my build with a forearm, trigger swap and Cerakote.

 

Thanks all for the help and advise.

[j.peace]

Question? So at the end a heavier buffer helped the bcg lock back?

Is that always the case. I figured and stress figured that a lighter buffer would cycle further back than a heavier buffer.

[survivalshop]

    KynShot Buffer is a hydraulic type unit , more than likely , too stiff for proper function . You could probably play with different buffer slings & gas adj. & get it to work  or even open up barrels gas port , as long as the gas block is centered .

[Robocop1051]

I think those hydraulic buffers were primarily intended for the FA crowd, to slow the cyclic rate. I've seen them mostly in the open bolt conversions, and suppressed FA.

Mine worked in my semi auto rifle, but obviously YMMV... I swapped for the XH buffer.

[j.peace]

I shot a guys lr308 with a hydraulic buffer and then immediately fired my lr308 without and mine kicks way less . although I have the Cooley brake and an 18" barrel and he had a 16"

Edited August 28, 2014 by j.peace

[Rsquared]

I'm not really a fan of the hydraulic buffers. Granted I have adjustable gas blocks, and heavybuffers in my 10's (mainly for suppressed fire). But they all shoot pretty smooth overall. Almost as smooth as many of my 15's.