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Thread: Does this upper look out of whack?

  1. #21
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    Keep us posted on the findings if you could

  2. #22
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    Did you post this on ARFCOM about it being a BCM upper on a PSA lower, with the consensus that the BCM upper was out of spec?

    ETA: The pictures look similar but they could be different uppers. The post on TOS was an out of spec BCM upper with amazingly similar issues.http://www.ar15.com/forums/t_3_118/5...t_problem.html
    Last edited by SW-Shooter; 04-24-12 at 16:48.

  3. #23
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    Quote Originally Posted by SW-Shooter View Post
    Did you post this on ARFCOM about it being a BCM upper on a PSA lower, with the consensus that the BCM upper was out of spec?

    ETA: The pictures look similar but they could be different uppers. The post on TOS was an out of spec BCM upper with amazingly similar issues.http://www.ar15.com/forums/t_3_118/5...t_problem.html
    No that is not my thread nor my upper.

  4. #24
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    Quote Originally Posted by 2arkba View Post
    No that is not my thread nor my upper.
    If yours is a BCM then I think there will be a few more of these issues come to light. I understand not wanting to out the manufacturer, but as a community we all deserve to know who it is exactly. I think that those that go unnamed only serves to give them a bad name, when it's known they tend to get a better reputation for their customer service handling the problem. Nothing looks legitimate when it is hidden from the community.

    Once is a mistake, two is a trend. There may be less aware owners out there that gets an out of spec upper and not have a clue that they have a defective upper, that may cause them to have a negative attitude towards our beloved Black Rifle. It's your choice whether or not to name the manufacturer. The truth is nobody makes perfection, mistakes happen to the best.

  5. #25
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    Quote Originally Posted by SW-Shooter View Post
    If yours is a BCM then I think there will be a few more of these issues come to light. I understand not wanting to out the manufacturer, but as a community we all deserve to know who it is exactly. I think that those that go unnamed only serves to give them a bad name, when it's known they tend to get a better reputation for their customer service handling the problem. Nothing looks legitimate when it is hidden from the community.

    Once is a mistake, two is a trend. There may be less aware owners out there that gets an out of spec upper and not have a clue that they have a defective upper, that may cause them to have a negative attitude towards our beloved Black Rifle. It's your choice whether or not to name the manufacturer. The truth is nobody makes perfection, mistakes happen to the best.
    I agree with that statement. At a time like this when everyone is scrambling to meet the demands there tends to be more incidents like this brought to light since the production is amped up. I could be wrong, but it is just a theory I have.

  6. #26
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    tagged to follow

  7. #27
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    Quote Originally Posted by SW-Shooter View Post
    If yours is a BCM then I think there will be a few more of these issues come to light. I understand not wanting to out the manufacturer, but as a community we all deserve to know who it is exactly. I think that those that go unnamed only serves to give them a bad name, when it's known they tend to get a better reputation for their customer service handling the problem. Nothing looks legitimate when it is hidden from the community.

    Once is a mistake, two is a trend. There may be less aware owners out there that gets an out of spec upper and not have a clue that they have a defective upper, that may cause them to have a negative attitude towards our beloved Black Rifle. It's your choice whether or not to name the manufacturer. The truth is nobody makes perfection, mistakes happen to the best.
    The OP is simply following M4C rules in regards to having a problem (be mechanical/cosmetic/whatever) with a product. You're supposed to contact the manufacturer and resolve the problem before naming names.

    Quote Originally Posted by TacMedic556 View Post
    tagged to follow
    There's an easy way to follow the thread--if you click on "Thread Tools" (on the right hand side of your screen, at the top of each thread), and then select "Subscribe to this Thread". You can then choose to get an email update each time a new post is made (or not). You can also go to your profile page and view the list of all threads you have subscribed to. Just an easy way of keeping track of thread without having to post in it.
    Last edited by SteadyUp; 04-25-12 at 21:02.
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  8. #28
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    YHM machines receivers for a lot of companies(keyhole forge), Bushmaster was one of them. When they receive forgings they are locked into a jig for machining. The carrier bore is drilled and reamed, after that everything should be taken from that bore so it becomes the center that everything else is based on. If the tab on the bottom of the receiver is centered on the carrier bore it should run ok. The outside forging shape does not mean anything really. Agree kind of looks bad and should be correct but may not hurt the function at all. The place I would be worried about is the barrel nut threads in relation to the carrier bore, it should be centered...concentric.
    I have seen both the YHM and Aero Precision receivers with issues like these. Upon contacting YHM and Surplus guns and ammo both of the responses were "prove they are wrong and we'll think about taking them back" Surplus owner actually said show me a print compared to the product and prove to me where it is wrong. Thats a waste of my time I just buy elsewhere that the product is correct to start with.
    YHM had a end mill chipped so it did not cut the channel for the charge handle to run in square, the rounded corners in the receiver hit the square edges just before the "T" on the charge handle. clearly a production problem. If you install one like that and let the charge handle fly, the charge handle scrapes the inside of the receiver YHM will not take it back because it scratched the inside of the receiver and they can't sell it to anyone else as new. Believe it or not. Some yoyo from YHM actually said I had modified the 3 receivers and they would not exchange them. Yeah I removed the anodizing from the receivers, welded a fillet into the corners and then had the receivers re-anodized so the charge handles wouldn't work
    Hopefully you purchased the receivers from someone that will admit there is an issue and take care of it.
    AR15performance
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    The 6.8 is the best choice for hunting deer and hogs with an AR15.

  9. #29
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    Quote Originally Posted by constructor View Post
    YHM machines receivers for a lot of companies(keyhole forge), Bushmaster was one of them. When they receive forgings they are locked into a jig for machining. The carrier bore is drilled and reamed, after that everything should be taken from that bore so it becomes the center that everything else is based on. If the tab on the bottom of the receiver is centered on the carrier bore it should run ok. The outside forging shape does not mean anything really. Agree kind of looks bad and should be correct but may not hurt the function at all. The place I would be worried about is the barrel nut threads in relation to the carrier bore, it should be centered...concentric.
    I have seen both the YHM and Aero Precision receivers with issues like these. Upon contacting YHM and Surplus guns and ammo both of the responses were "prove they are wrong and we'll think about taking them back" Surplus owner actually said show me a print compared to the product and prove to me where it is wrong. Thats a waste of my time I just buy elsewhere that the product is correct to start with.
    YHM had a end mill chipped so it did not cut the channel for the charge handle to run in square, the rounded corners in the receiver hit the square edges just before the "T" on the charge handle. clearly a production problem. If you install one like that and let the charge handle fly, the charge handle scrapes the inside of the receiver YHM will not take it back because it scratched the inside of the receiver and they can't sell it to anyone else as new. Believe it or not. Some yoyo from YHM actually said I had modified the 3 receivers and they would not exchange them. Yeah I removed the anodizing from the receivers, welded a fillet into the corners and then had the receivers re-anodized so the charge handles wouldn't work
    Hopefully you purchased the receivers from someone that will admit there is an issue and take care of it.

    I don't think you know what you are talking about, you have not only gone off the reservation, are out in left build, but Elvis has left the building. How about staying on topic here and not bash a company that has nothing to do with the topic at hand. Speculation is the problem you are facing.

  10. #30
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    Quote Originally Posted by SW-Shooter View Post
    I don't think you know what you are talking about, you have not only gone off the reservation, are out in left build, but Elvis has left the building. How about staying on topic here and not bash a company that has nothing to do with the topic at hand. Speculation is the problem you are facing.
    I didn't say it was YHM, Aero Precision or Bushmaster that made his receiver did I? If I did show me where Airborne. What I did say was I dont know if the front end where the barrel nut is concentric to the carrier bore but that is what I would be concerned about. The rear may not look good but it may not hurt the function at all. It just so happens I have seen the pallet setup and jigs YHM and CT use to machine the receivers. That is how I know how they are held and say IF all the machining was based on the carrier bore then the outside location may not matter as far as function.
    No speculation on my part at all, I know exactly who machined the parts I had issues with. I don't really care who made his receiver, I don't base my purchases off what is said on the internet. I don't have problems with the Mega receivers we currently use, never had issues with Vltor either. Have no idea who machines Bushmaster receivers now, could be them or DPMS or anyone.



    Last edited by constructor; 04-26-12 at 19:21.
    AR15performance
    TRUMP 2020
    The 6.8 is the best choice for hunting deer and hogs with an AR15.

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