I think this is a very legit reason to tell my wife that I need 3 AR lowers...

lavino

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I don't know what kind of black magic sorcery is this but do hear me out before drawing any conclusion. I am not sure if Brand really plays a part in here but I would like to present all the material first. I would like to avoid the brand bashing first.

Got 2 NEA 556 upper (1 full 1 stripped), 1 NEA 7.62 full upper, 1 Chiappa m4-22 gen2 upper, 1 556 upper from Nordic Marksman from unknown brand but has a square forge mark on it. Nordic Marksman said it is made and built in US.

Got 2 lower: 1 BCL(NEA) lower, 1 Anderson lower AM-15 (it is a combo deal with TNA).

Ok here goes the story:

I can put all uppers on the NEA lower and function check no problem.

I can put all uppers on the Anderson lower and function check no problem EXCEPT the 7.62 upper that just won't work either takedown or pivot pin. It is not tight.. I can't even push in either pin at all.

I checked with flash light and found the 2 circles are not completely overlapping so the pin wont' close. Checked with other spare takedown and pivot pins they all fits both upper and lower holes to rule out any other factor besides the upper and lower holes won't line-up

At this point I dunno what to say. Which part is out of sync? The Anderson lower is my first guess but wait.. it works on both the Chiappa and unknown upper from US not just the NEA stuff. Also both other NEA (that had 556 on it) works. Only the 7.62 doesn't. But the 7.62 works on the NEA lower...

I am confused .. very confused now. A third lower from a diff brand would help verify if which one is out of spec you think?

Nothing is really out right doesn't work here because besides the 7.62 won't mount on the Anderson lower I checked everything else all functioning fine. One thing that I know... one item here is not full-spec but I just don't know which.


*I know someone will say "Just buy a full factory rifle already damn it!" I know.. I am funny this way.. too late =P
 
I would think that you could meet someone at a range and see what fits on a their rifle.
 
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I would think that you could meet someone at a range and see what fits on a their rifle.

LOL yes I can ask my friend to check it but it would be nicer if I can convince my wife I need a new good factory AR ;)

Have that said.. it is possible that some upper won't fit nice with some other lower? You guys ever encounter cases like this?
 
Yeah because nea has a great track record
#### uppers won't work with #### lowers if you want a decent lower that dosnt break the bank just buy some aero precision lowers

Ok I heard people talk about Aero Precision I will keep an eye on it. I will run what I have for now and probably get one next year depends on how they perform in the matches. None of these were stress-tested so far.
 
On ar15 uppers, the rear lug 'hole' is actually a slot. This allows for slight linear and/or angular misalignment.

NEA decided to make the rear slot a hole on their uppers instead (it's possible they've changed this......but I've yet to see one of their uppers that has a slotted rear hole).

So while i wouldn't rule out the Anderson being the problem, the NEA is most likely the problem.

NEA outright refuses to have any sort of QC checks in place. I assume because people keep buying their products they feel no need
 
Yeah because nea has a great track record
#### uppers won't work with #### lowers if you want a decent lower that dosnt break the bank just buy some aero precision lowers

Exactly, they have had more than their share of problems in the past.
 
My Anderson lower receiver fits perfectly on an Aero Precision upper...just saying.

What is your 7.62 upper? 7.62x39? I have a 7.62x39 upper from Marstar that also fits the Anderson lower perfectly...so well, in fact that I'm going to build an Aero lower for the Aero upper and leave the Anderson where it is.
 
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