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Thread: Barrel retention screw

  1. #11
    XCR Guru mjorin's Avatar
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    I think Tera used to tell us to snug up the barrel retention bolt and give it an extra 1/4 turn.
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  2. #12
    XCR Guru Sean K.'s Avatar
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    Quote Originally Posted by mjorin View Post
    I think Tera used to tell us to snug up the barrel retention bolt and give it an extra 1/4 turn.
    Actually....and nothing against Terra (we all loved her)...but she was the one who said you couldn't tighten it too much, lol. Nobody's perfect.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  3. #13
    XCR Guru fmunk's Avatar
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    Probably not a bad idea to invest in a Fixit Stick kit, then add a compatible torque limited (from another source) that goes high enough for the barrel retention screw. Always good to have a compact all-in-one tool kit for field repairs.
    Fool-proofing serves only one purpose: identify bigger fools.

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  5. #14
    Newbie Rin's Avatar
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    Quote Originally Posted by Whole Bunches View Post
    I have 4 XCR-L uppers. I simply hand snug the bbl screw and don't gorilla crank it. Have never had it loosen. I check it every time I take one of the XCR-L's out to shoot.

    Gas setting for 5.56: Only 1 of my uppers has a type 3 gas system (a 7.5" pistol). On it, steel case factory ammo needs 1 click more open than brass case ammo. To function properly with brass case ammo in 70 degree or warmer temps, the gas is set on 1. At 50 degree I have to set it on 2. On 40 degree (the coldest I've had it out shooting) I have to set it on 3. As an experiment in the colder (for Florida!) temps, I warmed up a few rounds (sat them on the black dashboard of the car with the sun directly shining on them) and found I didn't need to open the gas up more than for 70 degree or warmer temps for proper functioning.

    On my type 1 gas system (16" 5.56), steel case factory ammo also needs 1 click more open than brass case.

    FWIW category: I reload steel cases. My steel case reloads use the same gas setting as for brass case with flawless functioning. I suspect it's because the act of tumbling the steel cases smooths the outside finish so they are slicker than factory steel cases.
    Thanks for the info. Would you say that the RA recommended 60 rounds break-in at maximum gas setting is necessary? AFAIK no other firearms (that I've happened to come across) require a break-in procedure.

  6. #15
    XCR Guru Sean K.'s Avatar
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    Quote Originally Posted by Rin View Post
    Thanks for the info. Would you say that the RA recommended 60 rounds break-in at maximum gas setting is necessary? AFAIK no other firearms (that I've happened to come across) require a break-in procedure.
    I've found that XCRs either work, or they don't. If they don't, it's nothing you can't fix yourself. I don't think the break in is necessary, however, it's not that uncommon in any new firearm for a round or two to not feed correctly, fail to eject, etc. when brand new, out of the box. A mag or 2 will usually fix that kind of hiccup....which is probably why RA makes the recommendation they do.

    Also, the old 'RA' recommendation was 200 rounds of good, brass cased ammo.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

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