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No, it is not.
BSF does not provide the height of the gas block, however it will definitely fit a 1.35" inner diameter handguard. It is unlikely that there is any handguard on the market this will not fit under. If you would like to contact BSF directly to find out the height, you can reach them here: https://www.bsfbarrels.com/product-page/low-profile-gas-block-875-set-screw