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Thread: GAS PORT DIMENSIONS

  1. #11
    Join Date
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    Why does it seem that BM barrel gas ports open faster than Colt ones? Is it a material issue?

    Quote Originally Posted by AR15barrels View Post
    Having personally measured about a hundred colt and bushmaster gas port diameters, I can state that they are the same within 14.5" and 16" carbine gassed barrels.
    All the others, it's anyone's guess.



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  2. #12
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    Quote Originally Posted by Iraqgunz View Post
    Why does it seem that BM barrel gas ports open faster than Colt ones? Is it a material issue?
    Most likely the difference between the 4140 they use and the 4150ish steel that Colt uses.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

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