6.5 grendel issue

[Jburke]

So I need input on this.  The bolt carrier does not lock up like it should.  It doesn't close all the way but the bolt seems to be as far forward as it should be, just not the carrier.  It must be something with the bolt itself because I switched out the carrier itself with another and same problem.  Any suggestions on what to check?  It's a 264 LBC barrel with type 2 bolt.

[Biggerhammer]

What barrel is on it? Make/manufacturer?

[CAMPMEAT]

Dirty.....?

[jay.sharkbait]

Is this with a round in the chamber?

[Heredoggydoggy]

Is it doing it with factory ammo, or reloads?  If reloads, and you are just neck resizing, you may be bulging the sides of the case just enough so the round is not chambering all the way.  Full-length resizing is almost a necessity with autoloaders.  Also check your case length on reloaded ammo.  If the case is too long, which tends to happen with fired bottle-necked cases, the neck may be bottoming in the chamber before it fully chambers.  Dirt was mentioned also--a dirty chamber might cause a round to not fully chamber, too.  I wouldn't worry about the bolt, as long as you have a Grendel Type II bolt.   

Warning!  Do not try to run your brass into a full-length reloading die unless you pull the bullet first.  Otherwise, you will get a stuck case in your die!

[mountainman]

Is it doing it with factory ammo, or reloads?  If reloads, and you are just neck resizing, you may be bulging the sides of the case just enough so the round is not chambering all the way.  Full-length resizing is almost a necessity with autoloaders.  Also check your case length on reloaded ammo.  If the case is too long, which tends to happen with fired bottle-necked cases, the neck may be bottoming in the chamber before it fully chambers.  Dirt was mentioned also--a dirty chamber might cause a round to not fully chamber, too.  I wouldn't worry about the bolt, as long as you have a Grendel Type II bolt.   

Warning!  Do not try to run your brass into a full-length reloading die unless you pull the bullet first.  Otherwise, you will get a stuck case in your die!

:yeah:and make sure the extractor is not bound and moves freely

[Biggerhammer]

Is this with a round in the chamber?

Guess that should have been the first question.

[jrebel]

Is this with a round in the chamber?

Guess that should have been the first question.

If there is a round in the chamber..it is doing the same thing my .223 was doing.  I bought a different bolt carrier group and it now works great.  I had previously worked on and upgraded the original extractor with no success.  My new bolt carrier is a Fail Zero nickle boron and it seems to cycle very smoothly. 

Good Luck and please update so everyone can learn. 

Thanks

jrebel

[Jburke]

Blackhole Weaponry barrel.  All parts are new and unfired. Factory ammo, this is with a round in the chamber.  The BCG closes like it should with an empty chamber.

[carpsniperg2]

Might be that the bullets are not seated deep enough. I have had that happen in the past with some factory loads.

[jrebel]

Blackhole Weaponry barrel.  All parts are new and unfired. Factory ammo, this is with a round in the chamber.  The BCG closes like it should with an empty chamber.

What did the brass look like?  Is it messing up the head stamp portion of the brass?  I have a thread with pic when mine was having the same problem....check it out....I think it was titled "ar help".

[Jburke]

I tried with two different factory loads, same results.  It doesn't look like the head stamp is really messed up.  The outer edge of the rim on the case is a little scratched though.

[jrebel]

I tried with two different factory loads, same results.  It doesn't look like the head stamp is really messed up.  The outer edge of the rim on the case is a little scratched though.

I haven't rebuilt my old bolt yet....but I am convinced the bolt was the problem.  I did a bcm extracted spring upgrade and it didn't help. 

Do you know someone that you could switch bolt carriers out with to see if that fixes the problem?

[Jburke]

I switched the bolt carrier itself out already with the one from my 5.56, only variable that stayed the same is the actual bolt and it's components, with the same result

[jrebel]

I switched the bolt carrier itself out already with the one from my 5.56, only variable that stayed the same is the actual bolt and it's components, with the same result

My bet if the bolt.....or extractor.  For some reason it is not grabbing the cartridge and locking into the lugs.  I am no expert but I am convinced my bolt or extractor is what went bad on mine.