Problems with my CA-10 (ar10) 6.5cm

[Punxsy Guy]

I am having problems with my Christensen Arms ca-10 6.5 creedmoor. I am new to ar10s and ar15s. I don't know everything. I am having trouble with it feeding. I shoot once then it does not chamber another round. The trigger always goes off but it does not chamber a bullet. It ejects every case just fine but I gotta we cock it every time to chamber another bullet.

I bought factory ammo to just test it because I didn't have everything to reload yet. I tried 120gr, 130gr, and 140gr bullets.

Actually the 140gr bullets did feed and recycle all just fine. I had problems with the 120gr and 130gr.

I am having problems with my Christensen Arms ca-10 6.5 creedmoor. I am new to ar10s and ar15s. I don't know everything. I am having trouble with it feeding. I shoot once then it does not chamber another round. The trigger always goes off but it does not chamber a bullet. It ejects every case just fine but I gotta we cock it every time to chamber another bullet.

I bought factory ammo to just test it because I didn't have everything to reload yet. I tried 120gr, 130gr, and 140gr bullets.

Actually the 140gr bullets did feed and recycle all just fine. I had problems with the 120gr and 130gr.

 

[Larryh128]

Does the bolt lock back on the last round?

 

[MGYSGT]

Your bolt is moving far enouh back to eject the fired case but not far enough back to pick up the next round (when shooting the light stuff). Had the same problem in an AR I owned. Not enough gas. Gas hole to small? Hole not aligned properly? Loads to light? Buffer too heavy (you can get lighter weights)? My problem came from a less than sturdy hold on the rifle and light loads In the offhand. I lost some of the energy on recoil not enough resistance. Mostly loads too light.

 

[dickn52]

Your bolt is moving far enouh back to eject the fired case but not far enough back to pick up the next round (when shooting the light stuff). Had the same problem in an AR I owned. Not enough gas. Gas hole to small? Hole not aligned properly? Loads to light? Buffer too heavy (you can get lighter weights)? My problem came from a less than sturdy hold on the rifle and light loads In the offhand. I lost some of the energy on recoil not enough resistance. Mostly loads too light.

I never thought limp wristing an AR was even possible, but I can see that it is with the pistol grip.

 

[kzin]

+1 bolt not going ALL the way back, too little gas or too much resistance.

Is there excessive resistance when charging manually?

Clean and well lubed?

Is the weather very cold?

Total round count? If its new a full box of 140s might loosen it up to the point light loads start working.

 

[brokeasajoke]

Lube, lube, lube, lube in my experiance. Also look to see of there had been a accuwedge used to take the play out between upper and lower. If so remove it and see if it will run. Tried a different mag?

 

[Punxsy Guy]

Does the bolt lock back on the last round?

No it does not lock back. I then lubed up everything and tried it again with just one in the magazine and it still didn't lock back.

 

[Punxsy Guy]

+1 bolt not going ALL the way back, too little gas or too much resistance.

Is there excessive resistance when charging manually?

Clean and well lubed?

Is the weather very cold?

Total round count? If its new a full box of 140s might loosen it up to the point light loads start working.

I shoot all 140s just fine. They were the first 20 shot.

I shot some 120s and 130s then about 10 or 15 each.

Today cleaned and lubed up really good and still didn't lock back.

I am pretty sure I am gonna get an adjustable gas block. I am thinking about getting one from superlative arms gas block because that's what Christensen Arms recommended.

 

[MrMajestic]

If you're not gassed enough w/o an adjustable block how do you think adding it will increase gas?

 

[Knotwild]

I would call Christensen Arms. I read the description of that rifle and it is odd to me that they used a mid length gas system and it has a fixed gas block. I researched building an AR 10 Creedmoor and most builders use a rifle length gas system (or longer) and adjustable gas block. My first suspicion would be that the gas port wasn't sized right and that Christensen should fix that under warranty, not tell you to buy a $110 dollar gas block. Don't get me wrong, I like the Superlative Arms gas block, and like MGYSGT said, the port could be undersized. That's a $2700 dollar rifle and it should arrive at your door in working order.

 

[brokeasajoke]

So it runs the 140s?

 

[Westhunder]

Did you do the proper break in? You have the break in the spring in the buffer tube. Google break in period. Usually it’s heavy hot loads. Pistols are the same way. Could also be a gas issue. Just thought I throw another angle out there.

 

[Punxsy Guy]

So it runs the 140s?

The it runs with the 140gr bullets

 

[Punxsy Guy]

Did you do the proper break in? You have the break in the spring in the buffer tube. Google break in period. Usually it’s heavy hot loads. Pistols are the same way. Could also be a gas issue. Just thought I throw another angle out there.

Thank you

 

[Westhunder]

Thank you

I’m assuming you read it and that’s a viable problem.... also explains why heavies are cycling

 

[Punxsy Guy]

I’m assuming you read it and that’s a viable problem.... also explains why heavies are cycling

I understand why the heavy bullets work just fine. I just kind of figured the gun work work with 120s and 130s too. They should of put an adjustable gas block on the gun in the first place with that heavy price tag of 3200$

 

[brokeasajoke]

As opposed to factory ammo I believe you can use a slower powder to increase port pressure but don't take that as fact.