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Black thorn 7.62x51

Big BS

By Big BS
in General Discussion

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Big BS Newbie

Big BS

Posted
Posted

Shells not ejecting properly every 2nd to 3rd she'll flips around completely while bolt is trying to jamb a new round in. I am new to this still learning all help is appreciated

Big BS Newbie

Big BS

Posted
  • Author
Posted

Yes new rifle using lots of lube I took rifle apart no big burs or hang up that I can feel or see noticed a lot of powder by the gas block all over the barrel do you think it could be a misaligned gas block

blue109 Experienced

blue109

Posted
Posted (edited)

did a quick google search...those things have a worse reputation than CMMG and POF combined! do the ejector and extractor have good spring tension? is it hard to seat a round flat against the bolt face by hand?

Edited by blue109
Robocop1051 Grand Master

Robocop1051

Posted
Posted

It's a BlackThorn... No bueno. Not necessarily bad parts, just bad builders.

You may have your work cut out for you. Id strip the bolt and check it all out thoroughly. Springs and extractor specifically.

Does the BCG hold back after the last shot? How does the gas system look?

98Z5V Grand Master

98Z5V

Posted
Posted

OP, cut your losses and just sell it on the local CraigsList or local Backpage.  Dump it and move on to something else.

 

Nobody here can possibly diagnose the amount of $hit you're going to go through with that contraption.

 

Research below - click that and read up.

 

https://www.google.com/search?q=Blackthorn+Vulcan+Hesse&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=nts

98Z5V Grand Master

98Z5V

Posted
Posted (edited)

Here's a Blackthorne rifle for ya, OP - first shot ever from this rifle.  Watch the vid.

 

http://www.liveleak.com/view?i=963_1392257627

 

Embedded the bolt in the guy's neck or shoulder.

 

That's a confidence builder in the brand, if I ever saw one.  True testament to the quality of the $hit they offer, too.

 

Get some!

Edited by 98Z5V
Dane Armory Newbie

Dane Armory

Posted
Posted (edited)

Check your gas block/tube by using airfrom an air hose or a can, put a fired. Brass shell in the chamber and blow it thur the gas tube end inside the upper reciever. Make sure you plug the end of the barrel.. if the brass case come out ... That's NOT your problem !

Then check the ejector and extractor.

Good Luck. You may need it !

I fixed a Black Thorne rifle once they Loctited so much stuff

and didn't tighten anything right. Loose handguard ,replaced ejector spring.

Installed springs backwards, gas block wasn't aligned. Took me 3.5 hours to make it right..

Edited by Dane Armory
FaRKle! Newbie

FaRKle!

Posted
Posted (edited)

Oh God, Blackthorne...

My friend's cousin bought one of their .308 stainless uppers. It wouldn't cycle for crap so he asked me to take a look at it.

Here's a summary of what I found wrong:

-Mis-aligned gas port to barrel extension (gas port was not at TDC).

-Mis-aligned clamp on gas block (only about 1/3 of the gas block hole was over the gas port).

-Loose gas block screws with no threadlocker.

-Undersized gas block (the gas block hole that goes over the gas port was smaller than the gas port).

-Poorly machined cam track (the cam pin would get stuck because the track wasn't machined large enough).

-Wrong extractor spring (they used a weak AR-15 one with no o-ring, it had very little tension).

I ended up having to realign the gas block, put threadlocker on the gas block screws, grind down the cam track a bit, and get a new extractor spring for it. Before that this gun wouldn't cycle 5 rounds in a row before having an FTE.

Robocop was with me one of the times I was troubleshooting this upper.

I'll echo the "start with the gas system" suggestion. If all is ok there, see if the BCG cycles smoothly by hand (work the action slowly). You should be able to feel any hangups. Also, check your extractor tension. Sometimes your failure to extract can be caused by the extractor letting go too early due to not enough tension.

Edited by FaRKle!
Big BS Newbie

Big BS

Posted
  • Author
Posted

Thanks for the help I have already experienced the extractor finger and pin problem and changed them to dpms part's thinking of doing the same with gas block. Maybe I will do what I was thinking of and change bolt and carrier and recheck head spacing

SpookyEng Newbie

SpookyEng

Posted
Posted

I had never heard of these guys, so I went to the website. Misspellings, wrong specs quoted (1/2 x 28 flash hider on a 308) and a bunch of mil spec quoting for standard processes. Why buy from someone like that? I would of sent that biotch back and if they wouldn't give me a refund it's BBB I go.

arnie Newbie

arnie

Posted
Posted

I have a Black thorne 308 upper and it was very agravating to get it up and running properly . I changed the springs in the extractor and ejector (both were very soft ) and put a new extractor from another bolt head (with an oring over the spring)and it works fine now .The chamber is cut too short so i have to set the shoulder back about .005 more than the die will go so that took grinding the bottom of the die off . Because of this i cant use factory loaded ammo.

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