M14,Norico,the bolt often come out.

[ccftca]

After about 40 rounds,the bolt always come out,anyone knows the problem? how do you guys fix it? thanks.

 

[chalkriver]

Do you mean when cocking the action the op rod slides off the bolt roller and the rod comes out of its track abit ?

 

[ccftca]

yes

 

[yomomma]

Your op rod guide might be loose. First place to look. Check out the stickies

 

[chalkriver]

Or if the op rod is in the track correctly and not loose and everything is greased well chances are you are pulling the op rod to the right a bit and that's causing it...pull straight back and let it go ..don't ride the cocking handle forward when releasing it .

 

[gyw]

After about 40 rounds,the bolt always come out,anyone knows the problem? how do you guys fix it? thanks.

most likely the op rod guide is loose . u can peen it tight to the barrel or put in a bigger roll pin in

 

[millwright]

I like green loctite and a new roll pin and of course a BFH for the fine tuning of the quide for alignment to pass the tilt test. You can always take a punch and peen your barrel where the op rod guide sits and then as Barney recommends do the double roll pin trick. One tiny pin in the other. Don't freak out if the op rod and gas piston don't line up perfect. Its not that big of a issue and things will still function fine. Seen some with only 1/2 the op rod touching the piston and no issue. Off course perfect is nicer but not necessary.

 

[TonyBen]

None of this is good. Something is awry here...

-Worn/out of spec operating rod tab
-Out of spec/worn operating rod tab track in the receiver
-Failed/missing/broken bolt roller

It doesn't matter how loose the operating rod guide is, the operating rod handle should never wiggle far enough to disengage the bolt. I have no experience with Norincos or Chinese rifles, so I don't know if this is common for y'alls up North.

If you feel that you must tighten the operating rod guide anyways, here's how I do it. There are other ways and this is not the only way to do it, it's just the way I like to.

[youtube]kBaeIzrQWAA[/youtube]

Here are examples of operating rod fit with op-rods that have different tab thicknesses in the same receiver/bolt combo. Notice the bolt roller relationship to the handle.

Op-rod with 0.092" tab.

op-rod with 0.097" tab

Op-rod with 0.089" tab

Tony.

 

[yomomma]

Hey Tony, this is one of the more common issues with our norcs.

Could be made worse if the oprod is bent.

 

[TonyBen]

Hey Tony, this is one of the more common issues with our norcs.

Could be made worse if the oprod is bent.

Thanks, I had a feeling that there were specific quirks to Norcs that I would not know. How do Norc bolt rollers/operating rod handles look normally compared to the pics I posted?

The pics I posted were with a 762mmfirearms receiver that came across my work bench.

Tony.

 

[millwright]

Ya this is one of the issues we have to deal with,with our cheap Norc's. First time I pulled mine back same thing happened. Thought I was sold a dysfunctional clone. But due to research and help from the gunnutz on this board I learned otherwise.

 

[45ACPKING]

Generally bolts/rollers on norcs are problem free.
Oprods on the other hand have been hit and miss in the past couple or so years. I've seen some bad ones.
Great info Tony....
I'd suspect a very marginalized oprod tab in this case. And as has been said possibly bent?

 

[rgallant]

Just just took a look at my shorty the roller is pretty much completely enclosed a little more so than your last picture.

 

[ccftca]

Thanks guys,what i`m doing is to bent the op rod back a little.
I 'll see if it works.

 

[JetRanger]

On mine, the guide was the proverbial hair too big and the pin slot was cut to almost twice the depth it should have been. A few minutes with a steel punch and some red locktite made it all good.

The groups tightened up properly after the fix.

BTW, many thanks to Barney, 45ACPKING and TonyBen for all your help and information.