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Thread: New build Short stroking issue diagnose

  1. #1
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    New build Short stroking issue diagnose

    Hello all,

    I have a short stroking issue I want some input on.

    Backstory: bought a new windham weaponry AR Orc rifle from academy sports 3 weeks ago (commercial buffer tube, carbine)

    Put a few hundred rounds thru her perfectly, from cheap steel to 556.
    Found a PSA FN upper I wanted and bought it with the intent of building another rifle with the windham upper.

    . list:

    Windham factory upper 16" carbine.
    New Spikes lower
    Spikes LPK
    Mil spec buffer tube (carbine buffer)
    Red barn armory auto BCG
    (BCG’s are complete and includes carrier (8620 Tool Steel), carrier key, bolt (9310 case hardened), extractor, extractor spring, extractor pin, ejector, ejector spring, ejector pin, firing pin, firing pin retainer, cam pin, (3) gas rings, and properly staked screws. Carrier and Gas key are chrome lined.)

    The gun was having issues with monarch 223 brass 55gr FMC

    Once I started using my m855 and m193 it was running perfect.

    So, I started thinking and I have a couple ideas.

    1. Check the carrier key torque and for leaks.

    2. I need to lower the buffer weight. ( can't find one lighter than the carbine buffer)

    3. Need to swap the mil spec tube for a commercial one, .5" longer.

    4. Leave alone and shoot mil ammo.

    What's your thoughts?

    Thanks
    Last edited by Xrob; 09-03-13 at 21:28. Reason: Ash556

  2. #2
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    Quote Originally Posted by Xrob View Post

    The gun was having issues with monarch 223 brass 55gr FMC
    This is your problem. The solution is to shoot quality ammo in the gun. You fixed your own problem by shooting M855. Continue to do so and you will have no issues.
    Semper Paratus Certified AR15 Armorer

  3. #3
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    4. Leave alone and shoot mil ammo.

    This would be my vote.

    Do you have access to a chronograph, so you could provide us the muzzle velocity of the Monarch 55g ammunition?
    Last edited by T2C; 09-03-13 at 13:03.
    Train 2 Win

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    Neg on the chrono.

    But, this "issue" makes sense, since the gun is set up to mil spec and only having issues with non-mil spec ammo.

    The way I see it now is, if one wants to be able to shoot commercial ammo, one should setup their rifle with a commercial buffer and semi BCG(although, my 1st rifle works with the auto).
    Last edited by Xrob; 09-03-13 at 13:19.

  5. #5
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    Make sure the BCG is well lubed.

    Put 1k of 5.56NATO pressure ammo through it.
    Then try the cheap range fodder.
    I bet you have better results.
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

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    The Monarch stuff is particularly low-pressure, even for .223 in my experience. PMC .223 is closer to 5.56 pressure and runs very consistently in my guns. I agree with the above poster that a well-lubed gun with 1,000 rounds of 5.56 through it may have loosened up enough to run the lower pressure .223.

    I wouldn't recommend setting the gun up to run lower pressure stuff. The reason your Windham upper does so is that it is over-gassed. Bushmaster/Windham and most other "commercial" AR manufacturers oversize their gas ports so they will run with weaker ammo and they won't get all the consumer complaints from guys who don't know any better.
    Semper Paratus Certified AR15 Armorer

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    Re: New build Short stroking issue diagnose

    Quote Originally Posted by Xrob View Post

    3. Need to swap the mil spec tube for a commercial one, .5" longer.


    What's your thoughts?

    Thanks
    Not sure what you're describing here, but the buffer tube / receiver extension isn't your problem. As has been stated, it's an ammo issue. How did you lubricate the upper?

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    Quote Originally Posted by mtdawg169 View Post
    Not sure what you're describing here, but the buffer tube / receiver extension isn't your problem. As has been stated, it's an ammo issue. How did you lubricate the upper?

    Drenched in lube for break in. CLP

    As what I mean about swapping tubes, with the commercial tube, springs and buffer weights being the same, the mil-spec is .5" shorter, so the spring is being compressed more, so it would take the higher pressure to push the BCG back far/long enough.

    So if I switch to a comm. tube, it will not take the high pressure of 556 to run.

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    Quote Originally Posted by ASH556 View Post
    The Monarch stuff is particularly low-pressure, even for .223 in my experience. PMC .223 is closer to 5.56 pressure and runs very consistently in my guns. I agree with the above poster that a well-lubed gun with 1,000 rounds of 5.56 through it may have loosened up enough to run the lower pressu
    I wouldn't recommend setting the gun up to run lower pressure stuff. The reason your Windham upper does so is that it is over-gassed. Bushmaster/Windham and most other "commercial" AR manufacturers oversize their gas ports so they will run with weaker ammo and they won't get all the consumer complaints from guys who don't know any better.
    I called Windham and found that the upper is NOT over gassed, it has the same diameter port as a 16" Colt, .063.

    You are putting out bad/in-correct info about Windham and probably BM. Not cool man.

    Windham is actually putting out very nice guns that are on Par or Better than the other high end AR rifles, they're QC is impressive, I have researched it plenty, go see for yourself.

    Also, if it was over gassed, that would help the short stroke issue.


    But I do appreciate your input.

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    Quote Originally Posted by Xrob View Post
    Drenched in lube for break in. CLP

    As what I mean about swapping tubes, with the commercial tube, springs and buffer weights being the same, the mil-spec is .5" shorter, so the spring is being compressed more, so it would take the higher pressure to push the BCG back far/long enough.

    So if I switch to a comm. tube, it will not take the high pressure of 556 to run.
    Measure the inner length of the tubes, not the exterior. Commercial and mil-spec are the same.

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