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Thread: Bolt inconsistently locking back on 10.3" carbine

  1. #21
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    Quote Originally Posted by MWAG19919 View Post
    I load on an XL650 and I have a 62 gr BTHP load that is sub MOA at this charge weight. It's a PITA to adjust the powder measure, but I'm more than willing to bump up the charge weight on the 55 gr load if that makes this gun happy.
    I load on a 550 - same powder measure - I bought one of these and found it helpful in keeping track of things - https://dawsonprecision.com/arredond...owder-measure/

    Probably costs a nickel to make but $4.95 isn't much, I just threw it onto a sight order.

    Anyways, tomorrow would you be will to PM me your recipe? 'Preciate it.
    Last edited by 26 Inf; 07-08-18 at 20:18.
    "If I had asked people what they wanted, they would have said a faster horse." - Henry Ford

    “You are responsible for your actions, but the world doesn’t turn around you, so it’s important that you find something bigger than yourself to work for, a way for you to make a difference.” - Drew Dix, MOH VN '68

  2. #22
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    Quote Originally Posted by 26 Inf View Post
    Not that I'm questioning what you say, buy could you tell me where I can find that info - I'm a copy and paste kind of guy. Thanks.
    Colt uses a gas port of .0625" and an H buffer for the 16" 6920.

    Colt uses a gas port of .0625" and an H2 buffer for the 14.5" M4.
    Quote Originally Posted by sinister View Post
    There are two kinds of nations in the world -- those that use Metric and those who have walked on the moon.
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  3. #23
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    Quote Originally Posted by 26 Inf View Post
    I load on a 550 - same powder measure - I bought one of these and found it helpful in keeping track of things - https://dawsonprecision.com/arredond...owder-measure/

    Probably costs a nickel to make but $4.95 isn't much, I just threw it onto a sight order.

    Anyways, tomorrow would you be will to PM me your recipe? 'Preciate it.
    I've always wondered about the powder measure upgrades. I got so tired of adjusting the measure in the wrong direction that I wrote +/- arrows in sharpie, but it's still very much a guess & check operation. And I'm so anal that I weigh 10 charges electronically and won't stop adjusting until I get 250.0 gr with 10 throws for a 25.0 gr load.

    Btw, your inbox is full.

  4. #24
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    Quote Originally Posted by MWAG19919 View Post
    I've always wondered about the powder measure upgrades. I got so tired of adjusting the measure in the wrong direction that I wrote +/- arrows in sharpie, but it's still very much a guess & check operation. And I'm so anal that I weigh 10 charges electronically and won't stop adjusting until I get 250.0 gr with 10 throws for a 25.0 gr load.

    Btw, your inbox is full.
    I think just having a dial with markings on it helps. I check mine just about the same way, and recheck the drop every second primer tube.

    In terms of repeatability, this one would seem to be pretty accurate and repeatable: http://www.uniquetek.com/product/T1231 It is $129.00 installed on a new bar.

    This is probably the next best thing: https://www.doublealpha.biz/click-ad...le-powder-knob
    "If I had asked people what they wanted, they would have said a faster horse." - Henry Ford

    “You are responsible for your actions, but the world doesn’t turn around you, so it’s important that you find something bigger than yourself to work for, a way for you to make a difference.” - Drew Dix, MOH VN '68

  5. #25
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    NiB is garbage. In addition NiB changes the dimensions of the components.

    Quote Originally Posted by MWAG19919 View Post
    I'm genuinely curious why you say that. The toolcraft was merely a spare I had lying around until this build happened, but I would expect a BCG with a lower friction coefficient to lock back before a phosphate coated one.

    Not being argumentative, just curious.



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  6. #26
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    It comes from first hand examination of the carbines as well as measuring ports in barrels.

    Quote Originally Posted by 26 Inf View Post
    Not that I'm questioning what you say, buy could you tell me where I can find that info - I'm a copy and paste kind of guy. Thanks.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  7. #27
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    Thanks!
    "If I had asked people what they wanted, they would have said a faster horse." - Henry Ford

    “You are responsible for your actions, but the world doesn’t turn around you, so it’s important that you find something bigger than yourself to work for, a way for you to make a difference.” - Drew Dix, MOH VN '68

  8. #28
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    Mechanical devices fail, and sometimes mechanical devices are sold that dont meet spec.

  9. #29
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    Is this a gun that would take a A5 buffer system? If so, why not go there, it fixes so many ills, just why not.

    Sorry if it's in middle of thread I skipped past.

    PB
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

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