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Gabriel, .750 - An adjustable recommendation is here : https://www.grendelhunter.com/product/750-adjustable-gas-block/

Gas Block Diameter: .750", Gas Block Journal Length: 1.9", Barrel Gas System: Rifle, ------------------- full specs here https://faxonfirearms.com/faxon-20-gunner-profile-ar15-barrel-6-5-grendel-nitrided/ ---------------------- I would only install an adjustable gas block if you plan on running a silencer/suppresor l, otherwise it's unnecessary, id go with a Faxon Low profile in stock here https://faxonfirearms.com/faxon-3-screw-750-low-profile-gas-block/ -------------------- You'll also need a rifle lenght gas tube in stock here https://faxonfirearms.com/ar-gas-tube-rifle-length/

Several in stock option here also https://www.budsgunshop.com/search.php/type/Gas+Blocks/other/in_stock/q/.750%20gas%20block/sort/relevance ------------- And rifle length gas tube here https://www.budsgunshop.com/search.php?q=Rifle+length+Gas+tube&type=