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Thread: Gun sluggish/problems chambering in "cold"

  1. #41
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    Paul how much wear do you have on your buffer springs?
    What do they measure out to?
    Also of you just install your bolt carrier in your upper receiver without a bolt in it do you feel any resistance as the carrier key closes on the gas tube?

    I have a VLTOR A5 on my BCM 14.5" Midlength. With 5.56mm NATO ammo it runs all day trouble free with a 5oz standard A5 buffer. With most .223Rem pressure I have to make the buffer 3.8oz by replacing one of its tungsten weights with a steel one.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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  2. #42
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    Just put my rifle out in the garage for a quick test myself. Outside air temp: 16 Degrees. I'll let it get good and cold for a few hours and then head out to the range.
    We are the first Warrior class in any Civilization to be provided with weapons and no belief system...... Dave Smith

  3. #43
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    Of those experiencing these issues, is the mid-length a common variable? And if it is, what buffers are running those guns?

    I still don't suspect a temp effect, but if the guns are close enough to threshold, anything is possible.

    We need a meteorology-type to weigh in on the effects of air temp, density, and pressure.
    2012 National Zumba Endurance Champion
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  4. #44
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    Mine's a ML 16" with a 0.080" gas port (measured with pin gauge) and a Vltor A5 with the standard buffer (whichever one comes with it) and the spring that comes with it. I'll get a weight on the buffer shortly. BCG is BCM, if that matters. Lube is (was?) Slip 2000 EWL 30wt. Thinking of just lubing it up with standard EWL vs. the 30 wt.

    Rounds for me hung up on the way into the chamber. tip would stop anywhere from the base of the feedramp to just past the top. I was able to slightly retract the CH (enough to get some momentum but not so much as to potentially cause a doublefeed) and seat the round every time it happened. Happened 8 times out of three, 28-round, magazines. Mags were Lancer AWM. Ammo was ASYM 55 grain.

    Air temp was mid-50s, unsure on humidity.
    Last edited by rob_s; 01-15-12 at 10:29.

  5. #45
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    Has anyone thought about the magazine

    Is it always the same magazine that causes this FltFd?

    Since you mention speed reload, is it possible the magazine is being inserted just a little bit too high into it's normal position and thereby robbing the BCG of it forward momentum while stripping the round?

    The rifle apparently runs fine when fired, and it's lubed and the parts will almost surely be within their respective specs (except the magazine catch position) so it falls back upon the operator or this settling of the magazine into it's proper place after the rifle cycles normally.

  6. #46
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    Rifle is good and cold now, air temp: 20 degrees. Will leave it for one more hour before heading to range.
    We are the first Warrior class in any Civilization to be provided with weapons and no belief system...... Dave Smith

  7. #47
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    Quote Originally Posted by Skintop911 View Post
    40-50 degrees is not cold. It might be cold perceptually to you warmer-climate guys, but it's not cold for the operating system. Your gun should not require any lube adjustments, special applications, or any change from normal PM at that temperature. It's performance should not vary at that temperature. If it does, and you are using known-good GI spec parts, your gun is broken and needs more detailed in-person inspection and diagnostics that can't be done via the net.

    If we were talking about temps much lower than that, freezing or below, that might be a variable. Up here in the northern tier, too many guns run well without special treatment to even think about temp in this case.
    X2. Up here our AR-15's run just fine down to -20°F.

  8. #48
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    Quote Originally Posted by Skintop911 View Post
    40-50 degrees is not cold. It might be cold perceptually to you warmer-climate guys, but it's not cold for the operating system. Your gun should not require any lube adjustments, special applications, or any change from normal PM at that temperature. It's performance should not vary at that temperature. If it does, and you are using known-good GI spec parts, your gun is broken and needs more detailed in-person inspection and diagnostics that can't be done via the net.

    If we were talking about temps much lower than that, freezing or below, that might be a variable. Up here in the northern tier, too many guns run well without special treatment to even think about temp in this case.
    regardless of my reply. I still think you might be more right.
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  9. #49
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    Just got back from the range. Cold as hell and the AR didn't have any feed problems. I used 28 rounds in Pmags ( loaded with 62 gr PMC Xtac ammo), and couldn't duplicate the misfeed. Just before the test the rifle had been cleaned and re lubed with Slip EWL
    Last edited by StrikerFired; 01-15-12 at 15:58.
    We are the first Warrior class in any Civilization to be provided with weapons and no belief system...... Dave Smith

  10. #50
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    i had issues in much colder climates but you never know so here goes

    completly degrese the weapon some people will hate this but wipe off all oil and grease then use brake cleaner and it will get everything off when the temp drops really low i didnt run any lube in my ar when i lived in alaska but were talking super cold and it would cause the firing pin enough drag to make rifle not fire

    in your area of the world after a complete degreasing i would put new lube like frog lube or slip2000 in it

    or ignore what i said since you have no idea who i am

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