AR Gas Block Threadlockers

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  • DAVE_M

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    Apr 17, 2009
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    Future reference, since someone mentioned Blue Loctite for gas blocks, never use Blue Loctite for gas blocks. Use Loctite 271 (Red) or Rocksett. Even with 271, it is not used in the correct application, although it is adequate, and does not have full strength. Loctite 222 (Purple) is the recommended threadlocker for small fasteners.

    Loctite 271 (Red) can be removed by force, but is best removed after being heated to 500°F (260°C). This can be done with a wood burner by heating the screw directly. Your barrel should be dimpled and you should be using knurled cup point set screws. By design, knurled cup point set screws will bite into the barrel as they are tightened. They are directional and when removed, the knurling will shear off. This is why you should discard them and replace with new screws. If using Rocksett, which is good up to 2000°F, you will need to soak the barrel and block in boiling water for an extended period of time to break the bond. Barrels will get hotter than 500 degrees, but Loctite 271 in conjunction with knurled cup point screws will hold on enough to prevent loosening. Rocksett and pinning becomes an option if Loctite 271 fails you. Loctite 242 (Blue) is only good up to 300°F, a temperature your barrel will regularly exceed.



    Photo Reference - Knurled Cup Point Set Screw

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    Photo Reference - Knurled Cup Point Set Screw with Loctite 271 after removal.

    49852641683_c66a5f6355_b.jpg


    Gas Block Dimpling Jig Process

     
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