New bolt seems to catch?

rethius

rethius

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Sorry for another post on my m14 triubleshooting.

Just recieved a new modified bolt for my 09 norinco. The new one has a smaller headspace and usgi internals on a 09 norinco platform. The problem is it seems to catch in the rear of the reciever when i engage the action. It is like the bolt catch is engaged, which it is not.

The original bolt does not catch and the action is smooth.

What do you think?

( if there is another post already on this topic please point me in that direction)
 
You got that bolt from me right?
It's new from a 2009 series. The bolt itself is not modified in any way but does have a full set of USGI internals. The bolt improved headspace measurements on 1 2005 and 2 2007 barrelled sctions by about Four thousands of an inch. One would think it a reasonable replacement for a rifle with headspace over 1.638".

Check the inside "roof" of your receiver for burrs or if the stripper clip guide pin is protruding at all into the top of receiver.
Is bolt stop factory?
Does it bind with trigger removed from stock?
 
If it is just a norky bolt with internals check some measurements from your old bolt and the new bolt.

When I replaced mine (USGI specs) I found that mine was binding too. I found that the new bolt was slightly oversized compared to the new one, and particularly on the trigger mechanism/rail guide (in the rear of the receiver) mine was binding as well. I used a little lapping compound and worked the bolt back and forth a few times, cleaned the receiver and bolt completely from the compound and there was no more binding, per se, but it was not as free as with my old bolt. I replaced the op spring and discovered that there was binding in the op rod itself, it was not cut properly and I was blowing rollers like crazy.

I purchased a dlask op rod, and all is good. No more binding and the rifle shoots as smooth as a well oiled machine.
 
you bet Doc, it is the one you sold me. The bolt seems perfect and I want to make it fit. I'll let you know how the inspection goes and I'll get back to you.

Sobo... what do you mean by Lapping compound?? what exactly do I do with this compound if I am to use it?
 
rethius said:
you bet Doc, it is the one you sold me. The bolt seems perfect and I want to make it fit. I'll let you know how the inspection goes and I'll get back to you.

Sobo... what do you mean by Lapping compound?? what exactly do I do with this compound if I am to use it?
Click to expand...

Lapping compound can be purchased at most automotive stores. I use it for valve lapping (seating into the cylinder heads). Essentially it is a paste with fine grit emulsified in it. When the material is applied to two metal surfaces and the surfaces are then rubbed, the grit will "sand" the two surfaces smooth.

If you have never seen lapping material, let alone used it, you have to be careful not to "sand" the metal surfaces too much...or worse yet, unintentionally "sand" metal surfaces which are not an issue by having the material come in contact with them.

Since I have some experience with the stuff I felt comfortable using it to the desired outcome I needed it for. I certainly is not rocket science, but overdoing it is not a good thing either. I suggest that if that is your decided course of action, take little baby steps. Mark your bolt with a black marker and work it a few times. examine the bolt for the telltale shininess of the marker ink being removed due to binding. Remember of course that the ink will wear on the surfaces where the bolt rubs against the receiver.
 
First, check that the right lug is not sticking or binding in the opening under ther rear sight/stripper clip guide area. Basically at the rear most of it's travel. I've seen this binding on a few new norcs, solved by fitting the right lug receiver bearing pad, on the bottom, just inside/behind the roller.
 
Thanks guys for the advise on lapping.. I think the problem lies where Doc suggested. The bolt moves fine until it gets to the rear most position.

So Doc.. :)redface:) what exactly do you mean by "solved by fitting the right lug receiver bearing pad, on the bottom, just inside/behind the roller"?

I really appreciate the help fella's! Sure do enjoy working on this thing, it has become quite the hobby. The wife doesnt even mind anymore!!!
 
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