ar issue............help!

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carlos velez

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i rebarreled my ar from 16" to 11.5". now its not locking up/feeding properly.
i was told, to install a heavy buffer which i did. still the problem is ongoing.
one guy at the range told me to install a heavier bolt carrier. will that solve the issue? i need your feedback;if you got past related issues similar to mine. thanks very much...........
 
carlos velez said:
i rebarreled my ar from 16" to 11.5". now its not locking up/feeding properly.
i was told, to install a heavy buffer which i did. still the problem is ongoing.
one guy at the range told me to install a heavier bolt carrier. will that solve the issue? i need your feedback;if you got past related issues similar to mine. thanks very much...........
Click to expand...

There are quite a few knowledgeable experts on CGN who can probably advise, but you'll need to provide them with some specifics about you did with respect to the upgrade and highlight exactly what is and isn't happening. The type of magazines and ammunition may be helpful as well.

Offhand, though - you shouldn't need to change either your buffer or bolt carrier.
 
carlos velez said:
i rebarreled my ar from 16" to 11.5". now its not locking up/feeding properly.
i was told, to install a heavy buffer which i did. still the problem is ongoing.
one guy at the range told me to install a heavier bolt carrier. will that solve the issue? i need your feedback;if you got past related issues similar to mine. thanks very much...........
Click to expand...

What is the feed problem?
Is the barrel new or cut down?

If a heavy buffer didn't change it, a heavier bolt carrier wont either.

Failure to feed?
Failure to eject?
Double feeds?
No locking back?
Etc? What is happening?
 
dangertree said:
What is the feed problem?
Is the barrel new or cut down?

If a heavy buffer didn't change it, a heavier bolt carrier wont either.

Failure to feed?
Failure to eject?
Double feeds?
No locking back?
Etc? What is happening?
Click to expand...

yes, exactly all of the above. its a brandnew dpms 11.5". like ive said, i replaced my buffer to a heavy one.........it didn't work! it jams and a live round stuck in the chamber. i have to force the cocking handle to eject that live round out of the chamber. i would appreciate any help you guys can provide me. thanks....
 
carlos velez said:
yes, exactly all of the above. its a brandnew dpms 11.5". like ive said, i replaced my buffer to a heavy one.........it didn't work! it jams and a live round stuck in the chamber. i have to force the cocking handle to eject that live round out of the chamber. i would appreciate any help you guys can provide me. thanks....
Click to expand...

Reloads or commerical ammo?
 
Look inside the chamber with a flashlight and see if it looks rough or rusty.

If you're shooting reloads, did you full length size them or only neck size them?

You have to be very specific when you want help diagnosing a gun.

-What ammo
-Clearly explain what the gun does or doesn't do
-Who swapped out the barrel for you
 
Gas port alignment issue or gas hole size was my first thought, until you mentioned rounds getting stuck in the chamber.

What method did you use to get the barrel nut off? Sounds like a tight chamer either caused by a factory defect, or distortion from being squeezed in a vice.

There are a number of factors that can cause this. I would suggest slowing down and actually posting step by step what you did. (ie. changed the barrel only and how, changed the whole upper, did you buy the barrel from a reputable dealer or off someone generic off the interweb etc etc.)
 
Allen Gun Works said:
Gas port alignment issue or gas hole size was my first thought, until you mentioned rounds getting stuck in the chamber.

What method did you use to get the barrel nut off? Sounds like a tight chamer either caused by a factory defect, or distortion from being squeezed in a vice.

There are a number of factors that can cause this. I would suggest slowing down and actually posting step by step what you did. (ie. changed the barrel only and how, changed the whole upper, did you buy the barrel from a reputable dealer or off someone generic off the interweb etc etc.)
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i bought the barrel brandnew(dpms) from a reputable dealer here in canada. reloads, i do. i tried my reload to my other ar no problem. plus i have a case gauge. gasport alighment, i know its all aligned. i just changed the barrel, not the upper. from 16" to 11.5" i have a brownells bench upper receiver block. ive the same problem in my previous gun(16" barrel). but when i replaced it with a heavy buffer. problem solved. now in my 11.5" barrel, i also replace my buffer to a heavy one. still the problem occurs. its very disappointing!
 
I will take a wild guess and say that your ammo is not hot enough to properly cycle with the shorter barrel. Try factory ammo, preferably AE.
 
carlos velez said:
reloads, i've tried my reloads to my other ar no problem. plus i have a case gauge. i know the gasport is aligned.
Click to expand...

I recently got an AR but we have been loading .223 for a while now. My AR has a match chamber and is significantly tighter than buddies Norc CQB and mini-14. When we set the brass up, on closer inspection of the case gauge the occasional case was just ever so slightly out of spec, but not enough to ever be a problem in the Norc or the Mini. Mine, the case would get stuck in the chamber so badly that I couldn't pull back the charging handle. I didn't want to resort to brute force and the forward assist was just enough to get it into battery. The rifle gas system had more than enough power to extract the case after discharge. The part that really drove me up the wall is that it wasn't every cartridge, it was a once and a while thing, but after finding the problem and screwing the die in a little bit more, problem solved.
 
if the case is stuck, something in the chamber or ammo is out of spec. get a brand new 223 round and see if that chambers and extracts

you said you had the same problem with the other barrel? bad bolt/headspace comes to mind also. a go-nogo gauge would be ideal here too.
 
P0WERWAGON said:
if the case is stuck, something in the chamber or ammo is out of spec. get a brand new 223 round and see if that chambers and extracts

you said you had the same problem with the other barrel? bad bolt/headspace comes to mind also. a go-nogo gauge would be ideal here too.
Click to expand...

thanks to all of you! i will try factory ammo. see if it will work. i will keep you posted.
 
carlos velez said:
i rebarreled my ar from 16" to 11.5". Now its not locking up/feeding properly.
I was told, to install a heavy buffer which i did. Still the problem is ongoing.
One guy at the range told me to install a heavier bolt carrier. Will that solve the issue? I need your feedback;if you got past related issues similar to mine. Thanks very much...........
Click to expand...

thank you to all you guys, i've tried factory load. All shots went thru without a jam!
 
The shorties usually like a hotter load to cycle properly. I'm guessing you probably have a tight chamber as well, so the combination of the two most likely are the root of your problems. Although not necessary, I like to run a full-auto bolt carrier and either an "H" or "H2" buffer in my shorties. The extra weight serves to somewhat minimize the battering the rifle is subjected to from the more violent recoil cycle of the shorter gas system. You didn't have issues with your reloads before because of the more forgiving = longer gas system, and probably a more generous chamber. I hope you have your problem licked. Shorty AR-15s are a blast, literally and figuratively. :)
 
If it is double feeding or failing to extract then you need to beef up the extractor with a heavier extractor spring, a black extractor buffer and /or a Dfender o-ring under the extractor. The Wolff extra power extractor spring is a cheap and easy fix.

While a rough chamber is possible, it is most likely a weak extractor issue on a shorty.
 
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