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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 07-05-2013, 5:05 PM
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Exclamation AR15 won't chamber round

I just finished building my AR15 but noticed that it wouldn't chamber the round when I went to test fire it..

It looks like the magazine doesn't get high enough for the BCG to hit it. I tried slamming the Pmag into the magazine well with 2 different magazines and same result. Any thoughts?

I attached 2 photos.

Last edited by VL221; 04-16-2014 at 8:18 PM..
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  #2  
Old 07-05-2013, 5:05 PM
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double check the depth of the bullet button? it may be preventing it from fully inserting, which is coincidentally, what she said.
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Old 07-05-2013, 5:11 PM
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Does the Mag "Lock" into the Mag well? Another words, once you have inserted the Mag as far as it will go, can you pull it out "without" having to press the Mag Release(AKA: Bullet Button)??
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Old 07-05-2013, 5:14 PM
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Can you take the upper off and get a picture of the feed ramps? Also, you weren't riding the CH back by any chance were you?

Also as the other posters have mentioned, check to see if the mag is actually seating correctly.
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  #5  
Old 07-05-2013, 5:27 PM
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Quote:
Originally Posted by jacobIDSC View Post
double check the depth of the bullet button? it may be preventing it from fully inserting, which is coincidentally, what she said.
How do I tighten it without the tool? I just used a allen wrench.

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Originally Posted by Wicked One View Post
Does the Mag "Lock" into the Mag well? Another words, once you have inserted the Mag as far as it will go, can you pull it out "without" having to press the Mag Release(AKA: Bullet Button)??
Yes, I have to use a 223 ammo to release the mag once it is in.

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Originally Posted by Merc1138 View Post
Can you take the upper off and get a picture of the feed ramps? Also, you weren't riding the CH back by any chance were you?

Also as the other posters have mentioned, check to see if the mag is actually seating correctly.
Yes, one sec.
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Old 07-05-2013, 5:43 PM
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Double checked the magazine without the upper and works fine. The bullet button spring is flush to the button.

I attached the pic of the feed ramp.

Last edited by VL221; 04-16-2014 at 8:18 PM..
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  #7  
Old 07-05-2013, 5:51 PM
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Looks high enough to me.

Steel case...ugh. Is that .223/5.56? It just looks really odd in the pics. Is it an 80% or finished factory lower & upper? .223/5.56 mags, correct?

Robert

Last edited by tanakasan; 07-05-2013 at 5:55 PM..
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  #8  
Old 07-05-2013, 5:54 PM
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Quote:
Originally Posted by tanakasan View Post
Looks high enough to me.

Steel case...ugh. Is that .223/5.56? Is it an 80% or finished factory lower & upper?

Robert
Yes, Tulammo .223. Finished lower and upper.
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  #9  
Old 07-05-2013, 5:55 PM
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Quote:
Originally Posted by Dr-Death View Post
picture from mag well area looking thru at upper location ?
Without the upper?
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Old 07-05-2013, 6:07 PM
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I vote for the bullet button.
I had a cheap bullet button and had issues getting my mags to seat and feed reliably.
I replaced the magazine lock with a RAD lock and problem was solved.
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Old 07-05-2013, 6:07 PM
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Quote:
Originally Posted by Dr-Death View Post
with
here

Last edited by VL221; 04-16-2014 at 8:18 PM..
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  #12  
Old 07-05-2013, 6:08 PM
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Quote:
Originally Posted by nastyhabts26 View Post
I vote for the bullet button.
I had a cheap bullet button and had issues getting my mags to seat and feed reliably.
I replaced the magazine lock with a RAD lock and problem was solved.
Gonna take out my bullet button and see if it's the problem
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  #13  
Old 07-05-2013, 6:15 PM
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Even when you lock the bolt back & release the catch on a loaded mag? Only when charging by hand?
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  #14  
Old 07-05-2013, 6:19 PM
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Took out the bullet button but the problem still exist.
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  #15  
Old 07-05-2013, 6:33 PM
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Try brass case ammo to see if it make a differents...i had an AR that did the same thing with steel ammo, but i use brass ammo case it work perfectly.
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  #16  
Old 07-05-2013, 6:39 PM
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Quote:
Originally Posted by tal3nt View Post
Even when you lock the bolt back & release the catch on a loaded mag? Only when charging by hand?
Only when I am charging by hand.

Quote:
Originally Posted by Bornonthe4thofJuly View Post
Try brass case ammo to see if it make a differents...i had an AR that did the same thing with steel ammo, but i use brass ammo case it work perfectly.
Man, I hope that is not the case.

I only have steel ammo and would hate to have to buy another case of brass ammo...
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  #17  
Old 07-05-2013, 6:41 PM
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I also vote ammo. Try brass cased. It looks like it is hanging up once the neck begins to hit the feed ramp. Either that or its a follower problem or COAL problem causing the cases to kind of rise up in the front.
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Old 07-05-2013, 6:42 PM
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Quote:
Originally Posted by VL221 View Post
Only when I am charging by hand.

you are riding the charging handle then. Gotta pull back and let it fly.
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  #19  
Old 07-05-2013, 6:43 PM
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I may have missed it, but have you tried different Mags?
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  #20  
Old 07-05-2013, 6:45 PM
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Quote:
Originally Posted by VL221 View Post
Only when I am charging by hand.



Man, I hope that is not the case.

I only have steel ammo and would hate to have to buy another case of brass ammo...
Don't worry about the ammo, you're riding the CH. That thing needs to slam forward at full speed.
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  #21  
Old 07-05-2013, 6:45 PM
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Quote:
Originally Posted by thenodnarb View Post
you are riding the charging handle then. Gotta pull back and let it fly.
Yes, I have done that and it doesn't work either. Same problem.

Quote:
Originally Posted by thenodnarb View Post
I also vote ammo. Try brass cased. It looks like it is hanging up once the neck begins to hit the feed ramp. Either that or its a follower problem or COAL problem causing the cases to kind of rise up in the front.
Would this be a BCG problem or upper ramp problem?

Would really like to get to the bottom of this so I know what to replace.

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Originally Posted by fallenknight308 View Post
I may have missed it, but have you tried different Mags?
Yes, 2 different pmags. Might try the 3rd one.
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  #22  
Old 07-05-2013, 6:50 PM
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Is the BCG just sliding right over the round or is the bullet getting stuck with the BCG jammed up right behind it?
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  #23  
Old 07-05-2013, 6:55 PM
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Quote:
Originally Posted by thenodnarb View Post
you are riding the charging handle then. Gotta pull back and let it fly.
Quote:
Originally Posted by tal3nt View Post
Even when you lock the bolt back & release the catch on a loaded mag? Only when charging by hand?
Quote:
Originally Posted by Merc1138 View Post
Don't worry about the ammo, you're riding the CH. That thing needs to slam forward at full speed.


You guys are right. I didn't slam it at full speed..fixed the problem, thanks guys
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  #24  
Old 07-05-2013, 7:01 PM
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if reloads.....cases too long? Bullets not seated deep enough ?
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  #25  
Old 07-05-2013, 7:01 PM
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First bad idea to trouble shoot with live ammo at home. Use dummy round.

Try without mag and round. Other things may be binding. Ie, bcg may bind on hammer, buffer retain detent, buffer tube, bolt catch, gas key etc. if works flawless then insert dummy rd, mag and chk. If still bind then try another bcg.

This will help narrow down the issue
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Old 07-05-2013, 7:02 PM
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Also, being a brand new build, it needs to wear in. Bang off a couple hundred then clean and lube.

Robert
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Old 07-05-2013, 7:19 PM
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Quote:
Originally Posted by walmart_ar15 View Post
First bad idea to trouble shoot with live ammo at home. Use dummy round.

Try without mag and round. Other things may be binding. Ie, bcg may bind on hammer, buffer retain detent, buffer tube, bolt catch, gas key etc. if works flawless then insert dummy rd, mag and chk. If still bind then try another bcg.

This will help narrow down the issue
Yes, I agree with that. That is why I didn't want to slam the BCG into the live ammo. But my safety was on and made sure my finger is off the trigger.
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Old 07-05-2013, 8:25 PM
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Quote:
Originally Posted by VL221 View Post
Yes, I agree with that. That is why I didn't want to slam the BCG into the live ammo. But my safety was on and made sure my finger is off the trigger.
Wouldn't matter. The concern here is a slamfire.
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Old 07-05-2013, 8:50 PM
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Quote:
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Wouldn't matter. The concern here is a slamfire.
I agree. The muzzle was faced in the safest possible direction in case of a unintended discharge.
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Old 07-05-2013, 8:57 PM
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At some point you may have to chamber a round at home, especially if you ever intend to use it for HD, so its kind of strange to say not to chamber live rounds at home ever.

I chamber live rounds in my home everyday in my Glock.

First priorority is to keep your finger outside of the trigger guard and muzzle pointed in a direction that if an AD/ND occurred, no one will get hurt.

As others have said, don't ride the CH home, and keep in mind if you are using 10 round mags, especially blocked mags, the last round is often very tight, and may also be more difficult to lock a mg into a closed bolt.

Last edited by Mossy Man; 07-05-2013 at 8:59 PM..
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  #31  
Old 07-06-2013, 1:35 AM
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I hear people talking about "slam firing" but have talked to two instructors that have said in there 25 years of teach students and shooting they have never had or seen any ar 15 slam fire. Just curious if anyone has had personal experience with slam firing?
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Wouldn't matter. The concern here is a slamfire.
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Old 07-06-2013, 4:22 AM
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Quote:
Originally Posted by Bornonthe4thofJuly View Post
Try brass case ammo to see if it make a differents...i had an AR that did the same thing with steel ammo, but i use brass ammo case it work perfectly.
That's got nothing to do with it. Glad to hear you have no issues though. Riding the CH or a slide on a semi-auto pistol is bad so live and learn :<)...
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Old 07-06-2013, 10:06 AM
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Quote:
Originally Posted by foreppin916 View Post
I hear people talking about "slam firing" but have talked to two instructors that have said in there 25 years of teach students and shooting they have never had or seen any ar 15 slam fire. Just curious if anyone has had personal experience with slam firing?
never seen slam fire issue with AR since I've been shooting them back in the early 80s.

it's easy enough to take out firing pin on AR to be extra safe...
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Old 07-06-2013, 12:52 PM
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I have never had an AD loading a round either /shrug. It's the interweb though so there's always plenty or rumors.
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Old 07-06-2013, 2:35 PM
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I'm having the same issue with my newly built AR and I'm using brass ammo. I'm with others that say mag catch or magazine issue. I had to replace my trigger and hammer because the sear wasn't setting causing some ammo feed issues.
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Old 07-06-2013, 2:47 PM
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If the bolt is picking up the round but not fully chambering check that when the gas tube was inserted into the fsb or gas block that it went in all the way so the pin went thru the tube and block. The gas tube should only go into upper receiver about 1 inch to match gas key depth. I did that on one of my first builds. The bolt may be held back about 1/4" by misaligning the tube and block.
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Old 07-06-2013, 6:12 PM
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Quote:
Originally Posted by negolien View Post
I have never had an AD loading a round either /shrug. It's the interweb though so there's always plenty or rumors.
On functional, proven arms. Op just built the ar.

There are other concerns if trying to trouble shoot with live round. If the lpk or lower is out of spec, hammer can folllow without pulling the trigger. Is the firing pin free floating or sticking with metal shaving? Mil-spec primer are harder to prevent slamfire, so it is uncommon, unless u'r unlucky. Ar firing pin hits the primer all the time when the round is chambered, just not hard enough. Chk it next time at the range for that small dent.

AD/ND does happen even with experienced shooter. I know plenty of folks with holes in the ceiling, wall, and floors.
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Old 07-07-2013, 1:11 AM
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Quote:
Originally Posted by VL221 View Post


You guys are right. I didn't slam it at full speed..fixed the problem, thanks guys
Don't even use the charging handle to chamber a round. Just use it to pull the bolt back, use the bolt hold-open to hold the bolt back, push the charging handle forward and locked, and then hit the bolt hold-open to chamber a round.
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  #39  
Old 07-07-2013, 2:47 AM
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Omg I can't believe this thread has gone on this long without seeing the age old post.

Oh well.

In before "Your rifle is garbage, better give it to me"
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Old 07-07-2013, 2:49 AM
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Quote:
Originally Posted by sigstroker View Post
Don't even use the charging handle to chamber a round. Just use it to pull the bolt back, use the bolt hold-open to hold the bolt back, push the charging handle forward and locked, and then hit the bolt hold-open to chamber a round.
You mean bolt catch?
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