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Thread: Pinned FSB vs LPGB Set Screws

  1. #1
    Join Date
    Dec 2015
    Feedback Score

    Pinned FSB vs LPGB Set Screws

    Is pinning a LPGB overkill provided the barrel is properly dimpled and the proper red loctite is used?

    BCM claims they have not had any of there's come loose.

    Pinning the FSB makes sense because its exposed. The FSB is potentially a exposed 2" lever that is susceptible to being twisted or knocked out of place where as the LPGB is not.
    Big brother is watching and listing...

  2. #2
    Join Date
    Mar 2011
    Mid-West, USA
    Feedback Score
    37 (100%)
    I consider it a safeguard, especially if your barrel is subjected to high heat cycles. (Such as shooting suppressed.)

  3. #3
    Join Date
    Jan 2018
    Feedback Score
    I don't know if it matters or helps, but I center punched the set screws on mine.

  4. #4
    Join Date
    Nov 2012
    Feedback Score
    3 (100%)
    I have pinned gas blocks, pinned gas blocks with set screws in barrel dimples, and gas blocks with set screws in barrel dimples.

    None have ever come loose on me, not even the unpinned ones. Dimple your barrel, use knurled tip screws, degrease the screws, degrease the threads in the gas block, apply Red 271, torque to spec, and allow it to cure. Or you can pin it as well, it certainly won't hurt anything.
    "Don't let yourself get attached to anything you are not willing to walk out on in 30 seconds flat if you feel the heat around the corner."- Neil McCauley

  5. #5
    Join Date
    Nov 2010
    Feedback Score
    20 (100%)
    Sometimes a little overkill is just right.

    Look at how wound up people get over staking carrier screws.

    These are pieces that you never want to come loose by themselves.

    Also, I'm not a fan of Loctite for most high heat applications.

    Get the gas block to 400F and it may as well not be there.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  6. #6
    Join Date
    Sep 2007
    Feedback Score
    14 (100%)
    If it's protected by the handguard, I don't care about pinning. Dimple and set screw however is a must. We had an adjustable gas block slip on us because I got lazy and didn't dimple.
    "You people have too much time on your hands." - scottryan

  7. #7
    Join Date
    Jun 2015
    Atlanta area
    Feedback Score
    1 (100%)
    How deep a dimple would you guys say is sufficient? I've used the SLR jig to double dimple all my LPGB barrels, and I probably go 40 thousandths or so and then use red Loctite, but I sometimes wonder if I shouldn't have gone 80 thou.


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