Picture request-NEA buffer return spring

skoal said:
Hey op if your in stoon you can try the spring out of mine before you buy one
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Appreciate that thanks but I'm in Ontario.



*MALICE* said:
That looks like it was cut, not broken.

I'm not saying it's what happened.........but it kind of looks like instead of fixing the root problem of it short stroking, they cut the spring to make it work properly.


You'll know for sure when you put a new spring in..........
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It does look cut to me. What are the root problems of an AR15 short stroking? It's possible that it was cut to fix the short stroking problem, it's 25.5cm and that's exactly what Thump pointed out was it was the minimum spring length for carbine receiver extension. Maybe it just had a rifle lenght one in by accident.
 
GuiltySpark said:
Appreciate that thanks but I'm in Ontario.





It does look cut to me. What are the root problems of an AR15 short stroking? It's possible that it was cut to fix the short stroking problem, it's 25.5cm and that's exactly what Thump pointed out was it was the minimum spring length for carbine receiver extension. Maybe it just had a rifle lenght one in by accident.
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Barring something like a loose gas key, it's usually that the gas port is undersized. Could also be a misaligned gas block?

If NEA used the wrong spring, they should have put the correct spring in rather than cutting one down...........assuming that is what they did.
 
GuiltySpark said:
I'll fire them off an email and see if I can get some light shed on this. I have a lot of faith in NEA and SFRC.
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if you go back to the first page of this thread I took the effort of writing the proper length and number of coils the spring should be.
Can you please at least tell us how many coils the spring has?
 
Thanks for writing that out Thump. In post #14 I mentioned that the cut spring is 25.5cms. I just counted the number of coils and got 32.
 
GuiltySpark said:
Thanks for writing that out Thump. In post #14 I mentioned that the cut spring is 25.5cms. I just counted the number of coils and got 32.
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Junk that spring and install a correct one. don't buy an "extra power" type spring.

If you begin having functionality issues with a proper spring then you will need to look deeper into the issue such as buffer type and weight, gas port diameter on the barrel etc.
 
thump_rrr said:
Junk that spring and install a correct one. don't buy an "extra power" type spring.

If you begin having functionality issues with a proper spring then you will need to look deeper into the issue such as buffer type and weight, gas port diameter on the barrel etc.
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Is checking the gas port diameter pretty straight forward if someone doesn't have experience tearing these apart?
 
16" car is .067 #51 drill and 20" rifle is .093 #42 drill (sizes from factory barrels)

If you can get your hands of machinist drill bits.... The # might be off, can someone else confirm...
 
GuiltySpark said:
Is checking the gas port diameter pretty straight forward if someone doesn't have experience tearing these apart?
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Remove handguard, loosen the two set screws on your gas block, slide the gas block forward. As DILLIGAF said, use number drills to gauge the gas port.

What length barrel do you have?
 
GuiltySpark said:
I have a 14.5" barrel.
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If you go by the arf com chart (assuming the gas block journal is .750") your gas port should be between .070"-.086".

Supposedly Colt M4 barrels are .063" (I've never actually measured one)

The arf com chart for a .625" journal calls for .063"-.078"

so use a 1/16" drill bit to start

#50 is .070"

5/64" is .0781"

#44 is .086"

*note - you are only using the drill bits to measure the hole,
 
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