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New LR 308 build problems


05titanle

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Yep well im not helping much lol....okay so looks like your mag is up where it needs to be...your bolt is behind the catch if i see it correctly...went and compared one loaded round of mine in a metal mag...and your bullet and my bullet are setting just about the same although from the pic it looks like your bullet is too low.

Im thinkin its your ares nib bcg.......any way to try another bcg?      Wash

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Take your bcg out and does the bolt rotate easy in the carrier ? remove extractor look for metal and lets have a pic of the spring setup under extractor.

heres another place that some folks are having prbs

08-06-2015, 7:37 PM
Don't get the Ares Armor Nickel Boron Bolt, I don't know if its a headspace issue within the carrier but the cam pin becomes stuck after only 10-20 rounds to the point where it jams up the entire rifle, and the only fix is to take it all apart and clean it....And no its not the ammo I tried Hornady, Winchester and Aguila all seem to dirty the BCG to the point of failure...
Wash
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05...    Did ya get ahold of unclemoak?

I think forum members might get a discount?    Ya know theres quite a few folks that have problems with N.i.b.   and youve seen it firsthand ....if it were me I would get a chrome bcg or a black nitride finish...theres not a damn thing wrong with the black phosphate or black nitride finish.The chrome bcgs are offered by fulton arms...they are dpms bcgs .... I have a couple of nitride bcg's and some chrome DPMS bcg's too......neither of which has given me any problems
     Wash

if you want a chrome bcg then go here   http://www.fulton-armory.com/boltcarriergroupcompletetitanincludesboltcomplete.aspx

Edited by washguy
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"  The photos show the Bolt" IS NOT" picking up or pushing the Cartridge into the Chamber , its going over the top of the Case base & the Round is being fed partly with the Carrier or the Bolt is skipping off the Base , both can be because of short cycling , be it firing the Rifle or by hand . 

  If it feeds from Bolt open & not from pulling the Charging Handle , even though it seems to be pulled back all the way or in firing the Rifle , the BCG is not coming back far enough to feed the Cartridge correctly .

 Not leaving out the BCG being out of spec's as was mentioned .

  Whats the Manufacturer of the Lower receiver ?

Edited by survivalshop
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05... I had a similar problem with my build, maybe not exactly, but similar.  Just spitballing here but my hammer spring wasn't installed properly which wasn't allowing the hammer to cycle correctly.  I installed it correctly (after Wash pointed out the problem) and it runs like a dream.  Maybe take a pic of the trigger assembly and make sure they (springs) are installed correctly... 

Welcome from Delaware....

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  I have an Early CMMG Lower Receiver that will not function with the Pmag , will work with any steel mag & the Lancer mag, but not any Pmag . The Upper Receiver works ( SI Defense gen. II ) works with Pmags on my two DPMS Lowers , so there has to be tolerance stacking with the CMMG , because it has the same type of FTF as yours . Not every round , but it will have issues with every mag.

     Saying that , check your PMag as to what Generation it is , because they changed the Gen 3 mags  & all Gen 3 work with the same CMMG Lower that the early first gen. Mag.. The Mag sits higher in the Mag well & I have measurements if you want them . You will be surprised at how a couple of thousands of an inch with make a difference . The Gen .3Mags are clearly marked " Gen. 3 ", I have a thread around here all about it , if I can find it . 

 Not saying its your issue , but might want to check it out .

 

  Edit : I see the mag in your photo is a Gen 3 , so that can't be it , but tolerance stacking can be , between the two different manufacturers Receivers . It is why I will only buy Receivers as a set by the same Manufacturer.

Edited by survivalshop
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  • 2 months later...

Okay,  Finally got to shoot the .308 today..... Here's what i did and what works..... so i changed out the bolt carrier group for the D Wilson and installed a Tubbs buffer spring. Now here is what that did.....   The bolt will lock back but there is a extractor problem. It pulls and case out of the chamber and it will lay on top of the magazine so if i have more then one round in the magazine it will jam because the spent case is still in there. So i will take the bolt apart and see what is going on....The D Wilson bolt does not lock up very smooth also.... Next i put the ARES bolt carrier group with the TUBBS spring and the gun runs fine.... 

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1 hour ago, jtallen83 said:

I had the same issue with a d Wilson BCG, changed the ejector spring out with a stiffer Armalite spring and haven't seen the issue since, your mileage may vary.

I knew it was something like that, a few guys have had this issue but I couldn't remember the remedy 

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2 hours ago, jtallen83 said:

I had the same issue with a d Wilson BCG, changed the ejector spring out with a stiffer Armalite spring and haven't seen the issue since, your mileage may vary.

  The two I have , I replaced the Extractors to a DPMS one & they run fine . Slightly different cures for the same issue , which really shouldn't be happening . This tolerance stacking because of no std. spec's for the 308AR is the real issue .

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05 Well you have come a long way from your first post ! so you have gone from a non-functioning rifle to one that works...good work!

so your gun runs fine with the original bcg now?     Well crap...send the other bcg back then if it fails to work...you got a working rifle now        Wash

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45 minutes ago, washguy said:

05 Well you have come a long way from your first post ! so you have gone from a non-functioning rifle to one that works...good work!

so your gun runs fine with the original bcg now?     Well crap...send the other bcg back then if it fails to work...you got a working rifle now        Wash

Are you kidding?  Since he has an extra BCG he needs to build another rifle around it! :banana:

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