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Thread: Removing/installing BCM low pro gas block (set screws)

  1. #1
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    Removing/installing BCM low pro gas block (set screws)

    I have a BCM factory upper that I want to change the rail on. Are there any tips on removing the low pro gas block? BCM uses 10-32 x 3/16 Knurled Cup Point set screws. Does anybody have a source for them and for high temp loctite/rock sett?

    Thank you!

  2. #2
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    You are going to need to heat them up and/or also use Bob Smith's Un-Cure. They use red Loctite to secure the screws.



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    Thank you. When reinstalling the screws, what kind of red loctite is recommended?

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    Quote Originally Posted by andy t View Post
    Thank you. When reinstalling the screws, what kind of red loctite is recommended?
    There ain't but one kind of red loc-tite.

  5. #5
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    Quick search on Amazon brings up the following red loctite variations:
    271, 262, 263, 277.

  6. #6
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    271 works just fine.

    Quote Originally Posted by andy t View Post
    Thank you. When reinstalling the screws, what kind of red loctite is recommended?



    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. #7
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    Quote Originally Posted by andy t View Post
    Quick search on Amazon brings up the following red loctite variations:
    271, 262, 263, 277.
    I learned something today. Thanks

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    Don't use Red Loctite. Use FLEXBAR - ROCKSETT available at Brownells.
    Rocksett.jpgRocksett.jpg

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    Quote Originally Posted by stainless_steel View Post
    Don't use Red Loctite. Use FLEXBAR - ROCKSETT available at Brownells.
    Rocksett.jpgRocksett.jpg
    Why, so you have to soak half your barrel in water to remove the screws next time? Red Loctite is more than adequate, hell even Gemtech says to use blue on their direct thread cans and its still a bitch to unscrew them. Red Loctite on knurled screws wont break loose without a fight even after torchin em. Bob Smith Un-Cure, like IG mentioned, works well but not all the time.

    One thing to note stainless steel, Rocksett does have a shelf life. Once exposed to air it starts to loose its bonding capability. Always buy the smallest amount possible.
    "your AR is shit, change my mind" - Will Larson

    I make work horses, not show ponies.

  10. #10
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    I tried both the Bob Smith Uncure and heat from a MAP torch. The set screws still wouldn't budge. I even managed to break a hex bit inside one of the set screws. At the end, the local "gun plumber" ended up cutting the gas block off.

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