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Thread: Facing an upper receiver ?

  1. #31
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    Quote Originally Posted by H Wyman View Post
    Lapping the extension on the upper receiver ensures no such thing. You'd have to assume that the bolt and barrel extension are perfect. That lapping tool is for shade tree gunsmiths. The process is appealing to a certain crowd because there's nothing else that can be smith'd in the shade of said tree to really improve accuracy.
    So, you have said tool in your physical custody and have measured it to be of shade tree specifications?

    Also, how can bringing a non-true receiver face BACK into spec-range not provide for more even distribution of recoil forces upon the bolt lugs, as long as they, too, are in-spec?
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  2. #32
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    so those of you who do not believe in lapping a receiver face are free to not lap.

    If you have never tried it then why do you think we should value your opinion?

    Personally I think all this In spec. Mil spec is all BS. Doesn't make the gun shoot better. Just makes it easier to control the low bid manufacturing process.

    this is like arguing over neck turning.

  3. #33
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    Quote Originally Posted by BufordTJustice View Post
    So, you have said tool in your physical custody and have measured it to be of shade tree specifications?

    Also, how can bringing a non-true receiver face BACK into spec-range not provide for more even distribution of recoil forces upon the bolt lugs, as long as they, too, are in-spec?
    All he is saying is that the tool and method are shade tree at best. I have no problem checking and correcting the face of the receiver if you are capable of doing it. I have problem with one size fits all shade tree methods. The only way the Brownell's tool could come close to working is if the pilot on it was perfectly sized for your receiver. Read the reviews if you doubt me. A professional smith would turn a bar the exact diameter or the receiver bore, sweat the receiver onto it and indicate the face. Trim it if necessary. He would also check the head space after trimming it. I love Brownell's but they do sell a lot of shade tree crap.

  4. #34
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    Quote Originally Posted by GH41 View Post
    All he is saying is that the tool and method are shade tree at best. I have no problem checking and correcting the face of the receiver if you are capable of doing it. I have problem with one size fits all shade tree methods. The only way the Brownell's tool could come close to working is if the pilot on it was perfectly sized for your receiver. Read the reviews if you doubt me. A professional smith would turn a bar the exact diameter or the receiver bore, sweat the receiver onto it and indicate the face. Trim it if necessary. He would also check the head space after trimming it. I love Brownell's but they do sell a lot of shade tree crap.
    A professional should know what is necessary and what isn't. Jesus Christ, I hold tenths on a daily basis, sweating shit in is overkill for anything to do with what they are talking about.

  5. #35
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    If your truing set-up doesn't look something like one of these, your just rubbing off anodizing.

    Action Truing.jpg

    Mandrel Truing.jpg

    Dial Indicator.jpg

    Precision modification requires precision tools.

  6. #36
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    Quote Originally Posted by H Wyman View Post
    If your truing set-up doesn't look something like one of these, your just rubbing off anodizing.

    Action Truing.jpg

    Mandrel Truing.jpg

    Dial Indicator.jpg

    Precision modification requires precision tools.
    If you're doing much more than removing a few thousandths, you're going to be staring at the barrel extension feed ramps over-hanging the receiver feed ramps.

    I've used the Brownells tool on 27 different receivers (and counting) and it has been a very tight, slip-fit affair in every single one. I've had to liberally apply EP grease to the bore of the receiver and tool for every upper receiver so far, or else you couldn't even get the tool in the receiver. You have obviously not used the tool.

    I'm going to assume you're aware of the issues of barrel extension protrusion overriding the feedramps in the receiver, as I have NEVER had to remove so much material as is seen in the photos you posted.

    I have, however, encountered the by-product of overzealous lathe work. The use of quality machines in a shop environment is NOT in any way a guarantee against improper machining. Tooling wears, machining rates vary, materials quality can vary (7075 machines quite differently from 6061), etc.
    Last edited by BufordTJustice; 07-18-15 at 18:38.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  7. #37
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    Quote Originally Posted by GH41 View Post
    All he is saying is that the tool and method are shade tree at best. I have no problem checking and correcting the face of the receiver if you are capable of doing it. I have problem with one size fits all shade tree methods. The only way the Brownell's tool could come close to working is if the pilot on it was perfectly sized for your receiver. Read the reviews if you doubt me. A professional smith would turn a bar the exact diameter or the receiver bore, sweat the receiver onto it and indicate the face. Trim it if necessary. He would also check the head space after trimming it. I love Brownell's but they do sell a lot of shade tree crap.
    Product reviews must be taken with a grain of salt. When the RRA trigger gets glowing reviews (you know, the one that has a long history of failing with only light use), it's pretty clear the qualifications of those making said reviews.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  8. #38
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    Quote Originally Posted by BufordTJustice View Post
    If you're doing much more than removing a few thousandths, you're going to be staring at the barrel extension feed ramps over-hanging the receiver feed ramps.

    I've used the Brownells tool on 27 different receivers (and counting) and it has been a very tight, slip-fit affair in every single one. I've had to liberally apply EP grease to the bore of the receiver and tool for every upper receiver so far, or else you couldn't even get the tool in the receiver. You have obviously not used the tool.

    I'm going to assume you're aware of the issues of barrel extension protrusion overriding the feedramps in the receiver, as I have NEVER had to remove so much material as is seen in the photos you posted.

    I have, however, encountered the by-product of overzealous lathe work. The use of quality machines in a shop environment is NOT in any way a guarantee against improper machining. Tooling wears, machining rates vary, materials quality can vary (7075 machines quite differently from 6061), etc.
    I buy quality components and don't sweat this issue. That being said, let's just agree to disagree. I sure hope you made good money on those 27 receivers. I'd hate to think your time isn't worth anything.

  9. #39
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    Quote Originally Posted by H Wyman View Post
    I buy quality components and don't sweat this issue. That being said, let's just agree to disagree. I sure hope you made good money on those 27 receivers. I'd hate to think your time isn't worth anything.
    I do them for friends. They're all patrol carbines for local and state LEOs... many of them on specialty teams. I don't charge.

    I already know the quality and value of my work. I don't need your approval or validation.
    Last edited by BufordTJustice; 07-18-15 at 18:48.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

  10. #40
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    Quote Originally Posted by BufordTJustice View Post
    I do them for friends. They're all patrol carbines for local and state LEOs... many of them on specialty teams. I don't charge.

    I already know the quality and value of my work. I don't need your approval or validation.
    Man the internet is entertaining

    people have no Idea what they are talking about and they are experts

    and people who do it all the time are shade tree gunsmiths

    Somewhere in there someone even said that after you lap the receiver face you better check headspace.

    You really have to filter your information on these forums. Opinion can become fact pretty quickly if you can convince enough that what you say it true.
    Last edited by rcoodyar15; 07-18-15 at 19:03.

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