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Thread: Bolt Not Fully Seating Round Into Chamber (Out Of Battery)

  1. #21
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    I am having the exact same problem on an AR pistol that I was shaking down for a friend. Will function fine for the first 6-8 shots and then fail to fully seat the next round. It has a Spikes Tactical pistol buffer kit, brand new. Using 30rd PMAGs. All premium, Federal brand .556 ammo. I too am going to try scrubbing the heck out of the chamber with some solvent and see if it helps. With the dirty operation of AR pistols it wouldn't surprise me if it was a dirty chamber. Some of the stuck rounds really needed some force to be extracted.

  2. #22
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    I don't think so and here's why. My 11.5" SBR with can mounted is also very dirty. I keep it lubed and clean it occassionally and I haven't had any issues and neither have those that shoot similar configurations with me.

    Who makes your barrel?

    Quote Originally Posted by Samba242 View Post
    I am having the exact same problem on an AR pistol that I was shaking down for a friend. Will function fine for the first 6-8 shots and then fail to fully seat the next round. It has a Spikes Tactical pistol buffer kit, brand new. Using 30rd PMAGs. All premium, Federal brand .556 ammo. I too am going to try scrubbing the heck out of the chamber with some solvent and see if it helps. With the dirty operation of AR pistols it wouldn't surprise me if it was a dirty chamber. Some of the stuck rounds really needed some force to be extracted.



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  3. #23
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    I am not entirely certain who made the barrel. It is a 7.5" barrel with a pistol length gas tube. It was not built by me, only brought to me when my buddy bought it and it would only fire one round without failing. It formerly had a GSE recoil kit on it that totally worked like crap. The hammer would never reset after the first shot and would only fire when cocked manually. I replaced the recoil kit with the Spikes pistol buffer kit, replaced a beat up FCG with all new Colt parts. The gun worked great for about 90 shots and then the issue which is the subject of this thread started popping up. I am more than open to suggestions on how to solve it.
    Last edited by Samba242; 10-04-11 at 19:32.

  4. #24
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    First, the 7.5" pistols are known to be some of the hardest to make run reliably. The reason I asked about the barrel is even though it may be marked 5.56 xxx whatever, some companies in fact use .223 chambers. So that could explain your failure to extract issue. Although I have to wonder because of what you're saying.

    I'll be quite honest to say that I hate attempting to diagnose this stuff when you can't take everything into account.

    Quote Originally Posted by Samba242 View Post
    I am not entirely certain who made the barrel. It is a 7.5" barrel with a pistol length gas tube. It was not built by me, only brought to me when my buddy bought it and it would only fire one round without failing. It formerly had a GSE recoil kit on it that totally worked like crap. The hammer would never reset after the first shot and would only fire when cocked manually. I replaced the recoil kit with the Spikes pistol buffer kit, replaced a beat up FCG with all new Colt parts. The gun worked great for about 90 shots and then the issue which is the subject of this thread started popping up. I am more than open to suggestions on how to solve it.



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  5. #25
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    Question.

    When you pull the charging handle to the rear and lock it, then insert a magazine with a round in it and release it, what happens?

    Quote Originally Posted by Scorpaznatica View Post
    I searched around and I am having trouble finding a definitive cause or solution to the issue I am experiencing. If I missed something, then I apologize for creating a superfluous thread. Feel free to link me to existing threads if they apply.

    The issue:
    I built the rifle a couple of months ago and have since put about 500 rounds through it. The first 400 or so went through flawlessly. More recently, the bolt seems to cycle, eject the casing, grab a new round, and then get stuck about a half of an inch short of closed. It started doing it once or twice in each 20-rd mag that I put through, but now it's doing it on almost every round. If manually pull the charging handle back a bit (not so far as cause a double-feed) and then sling-shot it, it chambers the round the rest of the way and goes all the way into battery just fine.

    If I lock the bolt back and manually place a round into the chamber, it gets very stiff and difficult to push in for the last 3/8" or so. It's almost as if the casing is just too large, or the chamber bore is just too small. It didn't seem to have any issue with this in first few hundred rounds through it.

    The rifle has been cleaned after every hundred rounds or so, and re-oiled before its next use. Any advice or suggestions on what could be causing this, or how to fix it?

    The rifle:
    Lower:
    PSA Stripped Lower Receiver
    PSA Magpul Lower Parts Kit

    Upper:
    BCM 16" Carbine-Length Upper Receiver Assembly
    BCM Gunfighter Mod 4 Charging Handle
    BCM Bolt Carrier Group



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  6. #26
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    Quote Originally Posted by Iraqgunz View Post
    Question.

    When you pull the charging handle to the rear and lock it, then insert a magazine with a round in it and release it, what happens?
    I have had it do both. Just the other day I was shooting and I had both results take take place back to back.

    The first result is that it slams the bolt home correctly, grabbing a fresh round on the way and seating it fully.

    The other result is that it grabs a round, begins to chamber, and then gets stuck just shy of battery. When this happens, I am able to pull the charging handle back about an inch, then slingshot it, and it closes all the way.

  7. #27
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    It sounds like some geometry or angle is off somewhere, and you're not getting consistent/correct feed angles.

  8. #28
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    interesting......

    you may be short stroking a bit, even though it gets behind the cartridge there is a fine line and if it just barely gets back then it is just not cutting it,

    Your main spring is shot, or you're hitting the gas tube with the magazine pushing the carrier up a bit when loaded. if so bend it down a bit and make sure key is good and tight.

    So, it's gotta be something like chamber getting dirty or main spring weak, if it was like a sharp edge it would have been worse in the beginning, but you never know.

    *I always replace main springs after a few run-ins I have had. One day when I was done shooting I left the gun on the bolt catch for a week or two and that bastard was about an inch shorter later and it was the first time I had used it. It was from a mil supplier but springs are funny.

  9. #29
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    Like I mentioned previously. I would send the upper in and have it looked it. There are too many variables and too much guesswork happening.



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  10. #30
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    Sorry to bring back an old thread.... but I seem to have sorted out the problem. The gun really liked lube and hated 30 round PMAGs. With a GENEROUSLY lubed BCG and a 20 round USGI mag it functioned flawlessly.
    Full-time LEO
    OPOTA certified semi-auto pistol, shotgun and carbine rifle instructor, Glock and Colt AR Armorer

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