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

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  #1  
Old 09-14-2010, 11:58 AM
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Default AR-15 jams with round in chamber

I just finished building my first AR and it hand cycles just fine when no ammo is involved, but the second a round is loaded into the chamber, the BCG gets stuck in the forward position and can't be pulled back, no matter how hard I try.

It'll budge about half an inch, just enough so you can use the forward assist to lock it forward again. I have to separate the upper and the lower so I can pry the BCG back and from there the round will eject properly.

I've tried loading a round in the chamber without the lower and it does the same exact thing.

Anybody have any ideas? I haven't fired it yet, so I have no clue how it behaves on the range, but this doesn't exactly fill me with confidence.
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  #2  
Old 09-14-2010, 12:01 PM
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what kind of a set up are you running? brands and specifics? can you tell which part of the gun is binding in the upper? any wear marks or raw aluminum showing? any wear marks on the bcg?
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Old 09-14-2010, 12:02 PM
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have you checked your headspace?
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Old 09-14-2010, 12:04 PM
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Are you using the correct ammo? Specs on upper and BCG? Lubed? Is the magazine fully inserted?
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  #5  
Old 09-14-2010, 12:10 PM
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Eh, snap cap? I would probably diagnose this without using live ammunition.... and we need details, please.
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Old 09-14-2010, 12:13 PM
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That happens to me at the range when using reloads and there is any dents or deformation in the brass.
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Old 09-14-2010, 12:14 PM
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Undersized chamber? Too short headspace?
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Old 09-14-2010, 1:15 PM
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Quote:
Originally Posted by Toma View Post
I just finished building my first AR and it hand cycles just fine when no ammo is involved, but the second a round is loaded into the chamber, the BCG gets stuck in the forward position and can't be pulled back, no matter how hard I try.
Pull the trigger.
The empty case will come out.

So far, you don't actually HAVE a problem.

Hand cycling proves nothing.
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Old 09-14-2010, 6:38 PM
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It's a Noveske upper with an 18" DPMS MK12 stainless barrel in 5.56 with extended M4 ramps and 1/8 twist. The BCG is MPI milspec, no brand name specified. This upper came as an assembly.

The bolt itself is getting stuck at what I'm guessing are the feed ramps; when you pull at the charging handle, it extends a little bit out of the carrier and that's about as far as it goes.

I'm using 5.56 Prvi Partizan M855 ammo, I've noticed that when the rounds are extracted, there's a few of scratches and gouges on the casing and bullet.
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Old 09-14-2010, 6:59 PM
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Next time you jam a round in the chamber like that, thump the butt on the ground while pulling back on the charging handle. Muzzle in safe direction, safety on, etc.
Chamber and breech area clean? Sounds like it's just a little new. It will most likely smooth up quite a bit with a few rounds through it.
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Old 09-14-2010, 7:03 PM
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is the bolt lubed and wet in the carrier? almost sounds like the lugs are sticky..
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Old 09-14-2010, 7:33 PM
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Quote:
Originally Posted by Toma View Post
It's a Noveske upper with an 18" DPMS MK12 stainless barrel in 5.56 with extended M4 ramps and 1/8 twist. The BCG is MPI milspec, no brand name specified. This upper came as an assembly.

The bolt itself is getting stuck at what I'm guessing are the feed ramps; when you pull at the charging handle, it extends a little bit out of the carrier and that's about as far as it goes.

I'm using 5.56 Prvi Partizan M855 ammo, I've noticed that when the rounds are extracted, there's a few of scratches and gouges on the casing and bullet.
Get some quality ammo. That PPU is crap.
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Old 09-14-2010, 7:33 PM
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step 1

post your location so a local "EXPERIENCED" calgun'er can help you out.
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  #14  
Old 09-14-2010, 7:54 PM
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Quote:
Originally Posted by buffybuster View Post
Get some quality ammo. That PPU is crap.
works fine in my ar style rifles. im going to go out on a limb, and say the cartridge is not at fault here.
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Old 09-14-2010, 8:15 PM
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Quote:
Originally Posted by Toma View Post
I just finished building my first AR
Did you build the upper yourself? Did you over torque everything down to spec? Are you sure everything in the lower is in the right place?
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Old 09-14-2010, 9:09 PM
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Quote:
Originally Posted by freonr22 View Post
is the bolt lubed and wet in the carrier? almost sounds like the lugs are sticky..
It's got some kind of white cream lube in it that I can see; I've never taken it apart, but that's probably my next step.

I didn't build the upper, it came fully assembled. The lower is assembled properly, plus it jams even if you manually load a cartridge in the chamber and lock the BCG by hand with the upper and lower separated.
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Old 09-14-2010, 9:25 PM
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I am thinking the laquer on the ammo might be a little thick. Do you have other 5.56 or 223 ammo handy to try? Maybe a 5.56/223 snap cap ...
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