M305 Firing Pin Replacement

Pr589

Pr589

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After about 3500 rounds, I have a chipped firing pin. A semi-circular sliver from the radius of the firing pin tip is visible, and moves independently from the bulk of the pin.

Does anyone know if US spec replacement firing pins fit the Norc bolts?

Further, I was going to order from Treeline but are there better sources? Also, while I'm eating shipping and brokerage costs, anything else I should be getting as spare parts (ejector, springs, etc.)?

Update:

It would appear that I made a premature diagnosis. After stripping the bolt it looks like the firing pin is fine but there was a chunk of metal that looks like a portion of the firing pin tip. Weird.

I will have to order from the US anyway. Upon reassembling the bolt I experienced the infamous "sproing" and the ejector has hidden itself somewhere in the bowels of the workshop. My guess is that it will turn up when the newly ordered part is delivered.

Pic below: On the left is the firing pin, on the right is the piece of metal that was around the pin, inside of the bolt. This must have been there from the factory. The reverse side of the firing-pin tip is symmetrical and looks like the side pictured.


 
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Holy crap!! The prices for parts at treeline seems pretty high.. Except for the stocks (without metal parts of course!) If you built the whole rifle from parts there it would be over 3k :) Norinco has spoiled me.

I did not see any firing pin there, or at Brownells...

BUT.. Numrich has em for $25 here :
www.gunpartscorp.com/ad/1138740.htm
 
Thanks guys. See update. Numrich seems to have the parts I need in stock.

Before I order, can anyone confirm if the US parts will fit a Norinco bolt?
 
bobbynewmark said:
do you have a micrometer or vernier calipers or something to precisely measure it?
Click to expand...

Bobby - I have calipers but help me understand what you suggest measuring and what we would be comparing against. Do you have some US spec parts that we could compare the Norc parts against?
 
I dont personally , no... but several people here do. Or may have the blueprint specs for reference. I have been looking online here for you but have had no luck thus far. However these drawings may be of interest now or in future:

www.m14.ca/blueprints/BoltAssy.pdf

www.m14.ca/blueprints/Bolt2of2.pdf

www.m14.ca/blueprints/Bolt1of2.pdf


www.google.ca/imgres?imgurl=http://...&iact=rc&uact=3&dur=278&page=1&start=0&ndsp=8


everything but the actual pin specs... At least you can see the channel size to compare against your NORC parts

i will keep looking until someone else more knowledgeable chimes in like Hungry or the like..

:)
 
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bobbynewmark said:
I dont personally , no... but several people here do. Or may have the blueprint specs for reference. I have been looking online here for you but have had no luck thus far. However these drawings may be of interest now or in future:

www.m14.ca/blueprints/BoltAssy.pdf

www.m14.ca/blueprints/Bolt2of2.pdf

www.m14.ca/blueprints/Bolt1of2.pdf

everything but the actual pin specs... At least you can see the channel size to compare against your NORC parts

i will keep looking until someone else more knowledgeable chimes in like Hungry or the like..

:)
Click to expand...

Bobby - Thanks for the help. Just examining these blueprints gives one new appreciation regarding how difficult these bolts are to machine.

At first blush it looks like the Norc firing pin diameter is larger than the diameter of the firing-pin channel in the drawing...but I may be reading it wrong. Hope Hungry or M14Doc chime in.
 
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