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7/6/2006 5:52:20 PM EDT
One of my 16s (a Norrell converted EA receiver) seems to have a problem with 5.56 uppers. It runs fine with the dedicated 22 upper and my Oly 9mm upper, but with two different 5.56 uppers it has the same problem (those uppers run fine on my other 16, a PAWS guns).

The problem is that it will fire one or two rounds and then do one of two things;

not pick up the next round in the magazine

or

pick up the round, but not reset the trigger

I've cleaned the gun thouroughly and tried two different buffers.  No help there.

Any suggestions?
7/7/2006 10:42:30 AM EDT
[#1]
Try a rate reducing buffer like the MGI..
Should fix it..
7/7/2006 10:44:48 AM EDT
[#2]
Which buffers have you tried and who manufactured your upper/barrel/bolt? Is your bolt carrier key properly staked?
7/7/2006 11:10:01 AM EDT
[#3]

Quoted:
Which buffers have you tried and who manufactured your upper/barrel/bolt? Is your bolt carrier key properly staked?


Probably wouldnt be an unproperly staked bolt cause it is getting another round from the mag.. Sounds more like bolt bounce..

What lenght barrels are these??
7/7/2006 11:14:43 AM EDT
[#4]
One upper is a Bushmaster 14.5" M4, the other is a CMMG 18" SPR. Each upper has its own BCG; both are properly staked.

Buffers are standard carbine buffer and endine hydraulic buffer. I'm going to try a rifle stock and buffer and see if that makes a difference.
7/7/2006 11:19:00 AM EDT
[#5]
If you have the rifle stock and buffer I would try that..  I would guess that is your problem..

Im sure someone else will chime in shortly..

Good luck and let us know what happens..
7/7/2006 11:19:26 AM EDT
[#6]

Quoted:

Buffers are standard carbine buffer and endine hydraulic buffer. I'm going to try a rifle stock and buffer and see if that makes a difference.


Good idea. Always start from a 100% stock gun when diagnosing problems.
7/7/2006 2:34:07 PM EDT
[#7]

Quoted:
The problem is that it will fire one or two rounds and then ... pick up the round, but not reset the trigger


Have you diagnosed the problem yet?  I am having the same issue, but mine is with a Ciener .22LR conversion kit and dedicated .22LR upper.
7/7/2006 3:04:57 PM EDT
[#8]

Quoted:

Quoted:
The problem is that it will fire one or two rounds and then ... pick up the round, but not reset the trigger


Have you diagnosed the problem yet?  I am having the same issue, but mine is with a Ciener .22LR conversion kit and dedicated .22LR upper.


Haven't had a chance to work on it, but it's not likely to be the same problem. My Keuhl 22 upper, which uses a modified Ciener kit, runs fine.
7/7/2006 3:56:28 PM EDT
[#9]
The best buffer I ever ran was the tungsten filled CAR buffer made by DPMS.
That was an instant fix for several shorty uppers I had giving me trouble.
Brownells had them MUCH cheaper than DPMS last time I checked.



PS.
DavidC...  Have you been getting my IM's ?  I sent you one last night and got no reply. I understand there are alot of folks here not getting IM's since the site upgrade. Didn't want you to think I forgot about the generator/625pd thing.

If IM's are unreliable, just take it to email...

[email protected]
7/8/2006 10:02:35 AM EDT
[#10]

Quoted:

Quoted:

Quoted:
The problem is that it will fire one or two rounds and then ... pick up the round, but not reset the trigger


Have you diagnosed the problem yet?  I am having the same issue, but mine is with a Ciener .22LR conversion kit and dedicated .22LR upper.


Haven't had a chance to work on it, but it's not likely to be the same problem. My Keuhl 22 upper, which uses a modified Ciener kit, runs fine.


My Kuehl .22LR upper, which also uses a modified Ciener kit, ran fine for months and a few thousand rounds.  My problem just developed recently, and I'm not sure where to start diagnosing it.  The last time I fired mine, I was with RenegadeX trying out Frisco's new LM7 upper.
7/10/2006 1:17:21 PM EDT
[#11]

Quoted:
One upper is a Bushmaster 14.5" M4, the other is a CMMG 18" SPR. Each upper has its own BCG; both are properly staked.

Buffers are standard carbine buffer and endine hydraulic buffer. I'm going to try a rifle stock and buffer and see if that makes a difference.


If you already have the carbine receiver endplate installed, give the H and H2 buffers a try first.
7/10/2006 1:35:19 PM EDT
[#12]

Quoted:

Quoted:
One upper is a Bushmaster 14.5" M4, the other is a CMMG 18" SPR. Each upper has its own BCG; both are properly staked.

Buffers are standard carbine buffer and endine hydraulic buffer. I'm going to try a rifle stock and buffer and see if that makes a difference.


If you already have the carbine receiver endplate installed, give the H and H2 buffers a try first.


I've got a spare rifle stock and buffer available. I'd have to go buy an H or H2 buffer.

If the rifle buffer solves the problem I'll see if someone at Bulletfest has a heavy carbine buffer I can try.
7/10/2006 2:56:37 PM EDT
[#13]
Dude, if you and the guys at Bulletfest cant get that thing running I would be surprised..
Good luck
7/11/2006 2:31:17 PM EDT
[#14]
I borrowed an H buffer from my gunsmith and that solved the problem.
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