Bolt carrier
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Thread: Bolt carrier

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    Default Bolt carrier

    If I use another bolt carrier with my current bolt on a PTR 91 will it change the headspace ?
    Thanks in advance
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    Most likely yes.

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    Quote Originally Posted by jerryhk91 View Post
    If I use another bolt carrier with my current bolt on a PTR 91 will it change the headspace ?
    Thanks in advance
    No it will not.

    Your locking piece and rollers determine what your bolt gap will be.

    The bolt carriers should all be the same spec.

    As long as you use the same bolt head and internals to that bolt head nothing will change.
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    Thanks alot for the information.

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    If you are using the same bolt,rollers and locking piece you should still check the bolt gap, I have done the same and have some bolt swaps that are ok but that's not always the case, I swapped out a bolt with a used HK factory bolt using the same rollers & locking piece and the bolt gap changed considerably, so double check that gap. This is just my personal experience, others may have never had any differences in the bolt gap when swapping carriers.
    Last edited by GregAB; 04-26-2020 at 06:53 PM.

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    It could.
    It depends on the spec tolerance of the bolt, locking piece and carrier. Tolerances can stack also used parts wear.
    It your rifle is near the end ranges of the bolt gap it could put you under or over.

    Anytime you change the bolt group or barrel on any firearm check the headspace or bolt gap on a roller locker before firing.
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    I guess, Yes.

  9. #8
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    Quote Originally Posted by HK556WI View Post
    No it will not.

    Your locking piece and rollers determine what your bolt gap will be.

    The bolt carriers should all be the same spec.

    As long as you use the same bolt head and internals to that bolt head nothing will change.
    I think in theory you may be right. All bolt carriers "should" be the same spec. But to be honest, my wife "should" have brought me a cold beer already today. She said she would.

    Anytime you change something in that assembly, check it. Takes about 60 seconds.
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    Cold beer , like the way you think !!!

    Thanks to everyone

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    Quote Originally Posted by Tug View Post
    I think in theory you may be right. All bolt carriers "should" be the same spec. But to be honest, my wife "should" have brought me a cold beer already today. She said she would.
    I gotta ask.......does this mean she is out of spec and needs replacing or just adjusting?

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