https://REDACTED/product/ar15-low-profile-chameleon-750-gas-block-oilslick-pvd-blemished/

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.750 Gas block for your Ar15 or Ar10 build.  Set screw mount.  Steel, coated with Oilslick PVD chameleon rainbow coating.  These may have a few blems, coating errors, oxidized/brown spots, etc.