HD Tactical

New Upper issue

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    F4E Phantom

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    I bought a new complete upper off Gunbroker. It is a new 16in heavy bbl.
    I attached it to a Spikes lower that hasn’t given me any problems whatsoever.
    Threw on a LPVO, cleaned the bore, added a few drops of oil and went to Element Range to sight it In. Sighting in took less than 10 rds at 36 yds. Groups were excellent with Scorpion(Czech) .223. Issue is the bolt won’t hold open after last round, I was using almost new Magpul 20 rd and beat up GI mag. Same issue. Tried LC green tips, same issue. No other problems, brass ejects 3-4 o’clock. Yes, the bolt will lock back if I put in an empty mag. Thoughts?
     
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    Senojeelnodnarb

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    The other 2 hit the nail on the head, either a bufferweight/ spring issue or your gas block may be askew. Either way your bolt is traveling far back enough to grab the next round, but not far enough to hit the bolt hold on the mag follower.
     
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    F4E Phantom

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    I was hoping it wasn’t a gas issue. Before I send it back, I’m going to try another lower. And lube the BCG better.
    The Spike lower has a standard carbine buffer.
    Much appreciated.
     
    Jester896

    Jester896

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    might try burnishing the chamber a little...it may be dragging a touch to slow things down since it is new. Shouldn't the brass be ejecting in the 1-2:00 area once it hits the deflector?
     
    Flounder Hounder

    Flounder Hounder

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    When it comes to AR-15 ejection patterns, understanding them can shed light on your rifle’s performance. Let’s dive into the brass-spitting behavior of your trusty AR-15:

    1. Ejection Pattern Basics:
      • Imagine the face of a clock: The rifle’s barrel points to 12:00, the ejection port is at the center, and the stock points to 6:00.
      • Ideally, your AR-15 should eject spent cases from 3:00 to 4:30.
      • If the ejection pattern falls between 12:00 and 3:00, it’s over-gassing.
      • If it falls between 4:30 and 6:00, it’s short-stroking.
    2. Over-Gassing (12:00 to 3:00):
      • Over-gassing occurs when excessive pressure reaches the upper receiver and bolt carrier group (BCG).
      • Quick fix: Consider replacing the stock gas block with an adjustable gas block to fine-tune gas pressure.
      • Alternatively, try a heavier buffer or adjust the buffer spring for less resistance.
    3. Ideal Ejection (3:00 to 4:30):
      • If your brass ejects at a 90 to 135-degree angle, you’re golden! No issues here.
    4. Short-Stroking (4:30 to 6:00):
      • Short-stroking means insufficient gas pressure reaching the upper receiver and BCG.
      • Opposite of over-gassing.
      • Check gas system components and ensure proper function.
     
    Jester896

    Jester896

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    won't be the first time I got it backwards...thanks!...maybe a picture of the fired brass would tell if it was hanging.
     
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    Murfpcola

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    While you are at the range trouble shooting, try a known good bcg in case you are having trouble with the gas key etc.
     
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    F4E Phantom

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    Yes, next range trip I’m taking an extra bolt, sweep away brass left over. Someone had a M249, there was scores of brass and links all over. Luckily the .223 ammo I was using was well polished. That Czech made Scropion .223 shot real nice.
     
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    850guns

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    F4E Phantom said:
    Yes, next range trip I’m taking an extra bolt, sweep away brass left over. Someone had a M249, there was scores of brass and links all over. Luckily the .223 ammo I was using was well polished. That Czech made Scropion .223 shot real nice.
    Click to expand...
    Czech .223?
     
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    justapilgrim

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    Flounder Hounder said:
    When it comes to AR-15 ejection patterns, understanding them can shed light on your rifle’s performance. Let’s dive into the brass-spitting behavior of your trusty AR-15:

    1. Ejection Pattern Basics:
      • Imagine the face of a clock: The rifle’s barrel points to 12:00, the ejection port is at the center, and the stock points to 6:00.
      • Ideally, your AR-15 should eject spent cases from 3:00 to 4:30.
      • If the ejection pattern falls between 12:00 and 3:00, it’s over-gassing.
      • If it falls between 4:30 and 6:00, it’s short-stroking.
    2. Over-Gassing (12:00 to 3:00):
      • Over-gassing occurs when excessive pressure reaches the upper receiver and bolt carrier group (BCG).
      • Quick fix: Consider replacing the stock gas block with an adjustable gas block to fine-tune gas pressure.
      • Alternatively, try a heavier buffer or adjust the buffer spring for less resistance.
    3. Ideal Ejection (3:00 to 4:30):
      • If your brass ejects at a 90 to 135-degree angle, you’re golden! No issues here.
    4. Short-Stroking (4:30 to 6:00):
      • Short-stroking means insufficient gas pressure reaching the upper receiver and BCG.
      • Opposite of over-gassing.
      • Check gas system components and ensure proper function.
    Click to expand...
    What is the original source for this helpful info?
     
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    F4E Phantom

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    Update today.
    I put the Upper on my A2 Lower(rifle stock/buffer) NO issues with short stroking. Ejecting patterns at 3-4 o’clock. I started with PPU 5.56, then PPU .223 and Federal .223. Glad I didn’t have to sent it back . The upper I got off Gunbroker was from AR-15Parts.com out of Sherman,Tx
     
    Jester896

    Jester896

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    all you did was change the lower? did you clean the upper after you fired it last? does the lower you used today have the same spring and buffer in it?
     
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    F4E Phantom

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    Yes, all I did was change Lowers. The Lower that gave me problems had a carbine buffer/spring.Only cleaning I did was a wipe down and well oiled BCG
     
    Jester896

    Jester896

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    ahh...you change 2 things...wonder which one it was or was it the combination
     
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