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Thread: Parts to complete bolt

  1. #11
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    Quote Originally Posted by GH41 View Post
    It is your dice to roll. Being a blem is cosmetic. Being rejected for QC issues isn't blemished. It means they are junk. Spikes isn't exactly top tier but they are better than some. I would worry about them being from the scrap barrel if they aren't marked. You call.
    I've bought the same bolts from him before. They look fine and run fine in my rifles
    This dealer has sold too much stuff he would have been called out if he sold junk
    Last edited by snackgunner; 09-23-19 at 03:30.

  2. #12
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    for the gas rings, these two options are essentially the same thing?
    is one preferred over the other?
    https://dsgarms.com/upper-receiver-parts-dsg-4102-0009
    and
    https://dsgarms.com/upper-receiver-parts-armeb0120-3

  3. #13
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    The 3 piece rings are mil-spec.

    The 1 piece is not.

    Quote Originally Posted by snackgunner View Post
    for the gas rings, these two options are essentially the same thing?
    is one preferred over the other?
    https://dsgarms.com/upper-receiver-parts-dsg-4102-0009
    and
    https://dsgarms.com/upper-receiver-parts-armeb0120-3
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

  4. #14
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    I could swear Crane qualified a 1-piece McFarland....

    Quote Originally Posted by Clint View Post
    The 3 piece rings are mil-spec.

    The 1 piece is not.

  5. #15
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    Who knows; maybe they did.

    I'd stick with the regular 3 piece design.

    Quote Originally Posted by tehpwnag3 View Post
    I could swear Crane qualified a 1-piece McFarland....
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

  6. #16
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    Quote Originally Posted by tehpwnag3 View Post
    I could swear Crane qualified a 1-piece McFarland....
    According to Wikia.org/Military, they did for the CQBR/Mk18 upper receiver assembly. https://military.wikia.org/wiki/Clos...attle_Receiver

    Quote: "The short 10.3 in (262 mm) barrel length requires special modifications to reliably function. The gas port is opened from 0.062 to 0.070 in (0.16 to 0.18 mm). A one-piece McFarland gas ring replaces the three-piece gas ring set. The standard four-coil extractor spring is replaced with a commercial off-the-shelf (COTS) five-coil spring. An O-ring surrounds the extractor spring. The standard M4 flash hider has been replaced with the M4QD flash hider for suppressor compatibility."

  7. #17
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    Quote Originally Posted by Clint View Post

    I'd stick with the regular 3 piece design.
    why?

    just curious what your reasoning is

  8. #18
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    Quote Originally Posted by snackgunner View Post
    why?

    just curious what your reasoning is
    This is a good read:https://www.m4carbine.net/showthread...your-gas-rings

  9. #19
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    The standard rings just plain work.

    It's hard to argue changing them for something less proven that may potentially cause issues.
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

  10. #20
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    IIRC, most of the problems with McFarland rings were due to improper sizing, material, and treatment. Process issues, mostly. Not all one-piece rings are the same ("parts is parts"). And because it's a wizbang part, a quality unit does cost 3x more than a perfectly good set of regular rings. So, while it could be a viable enhancement, I think distrust overran the concept. One could say that they are a solution looking for a problem, however, as linked above, Crane deemed them worthy for a fairly harsh application.

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